docs: add spdx tags to all .md files

I have no idea if this is going to cause rendering problems, and it is fairly
hard to check. So let's just merge this, and if it github markdown processor
doesn't like it, revert.

docs/ARCHITECTURE.md

@@ -2,6 +2,7 @@
 title: systemd Repository Architecture
 category: Contributing
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Code Map

docs/AUTOMATIC_BOOT_ASSESSMENT.md

@@ -2,6 +2,7 @@
 title: Automatic Boot Assessment
 category: Booting
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Automatic Boot Assessment

docs/BLOCK_DEVICE_LOCKING.md

@@ -2,6 +2,7 @@
 title: Locking Block Device Access
 category: Interfaces
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Locking Block Device Access

docs/BOOT_LOADER_INTERFACE.md

@@ -2,6 +2,7 @@
 title: Boot Loader Interface
 category: Booting
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # The Boot Loader Interface

docs/BOOT_LOADER_SPECIFICATION.md

@@ -2,6 +2,7 @@
 title: Boot Loader Specification
 category: Booting
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # The Boot Loader Specification

docs/CGROUP_DELEGATION.md

@@ -2,6 +2,7 @@
 title: Control Group APIs and Delegation
 category: Interfaces
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Control Group APIs and Delegation

docs/CODE_OF_CONDUCT.md

@@ -2,6 +2,7 @@
 title: systemd Community Conduct Guidelines
 category: Contributing
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # The systemd Community Conduct Guidelines

docs/CODE_QUALITY.md

@@ -2,6 +2,7 @@
 title: Code Quality Tools
 category: Contributing
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Code Quality Tools

docs/CODING_STYLE.md

@@ -2,6 +2,7 @@
 title: Coding Style
 category: Contributing
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Coding Style

docs/CONTAINER_INTERFACE.md

@@ -2,6 +2,7 @@
 title: Container Interface
 category: Interfaces
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # The Container Interface

docs/CONTRIBUTING.md

@@ -2,6 +2,7 @@
 title: Contributing
 category: Contributing
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Contributing

docs/CONVERTING_TO_HOMED.md

@@ -2,6 +2,7 @@
 title: Converting Existing Users to systemd-homed
 category: Users, Groups and Home Directories
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Converting Existing Users to systemd-homed managed Users

docs/COREDUMP_PACKAGE_METADATA.md

@@ -2,6 +2,7 @@
 title: Package Metadata for Core Files
 category: Interfaces
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Package Metadata for Core Files

docs/DESKTOP_ENVIRONMENTS.md

@@ -2,6 +2,7 @@
 title: Desktop Environment Integration
 category: Concepts
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Desktop Environments

docs/DISCOVERABLE_PARTITIONS.md

@@ -2,6 +2,7 @@
 title: Discoverable Partitions Specification
 category: Concepts
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 # The Discoverable Partitions Specification
 

docs/DISTRO_PORTING.md

@@ -2,6 +2,7 @@
 title: Porting systemd To New Distributions
 category: Concepts
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Porting systemd To New Distributions

docs/ENVIRONMENT.md

@@ -2,6 +2,7 @@
 title: Known Environment Variables
 category: Interfaces
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Known Environment Variables

docs/GROUP_RECORD.md

@@ -2,6 +2,7 @@
 title: JSON Group Records
 category: Users, Groups and Home Directories
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # JSON Group Records

docs/GVARIANT-SERIALIZATION.md

@@ -2,6 +2,7 @@
 title: GVariant D-Bus Message Serialization
 category: Interfaces
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # GVariant D-Bus Message Serialization

docs/HACKING.md

@@ -2,6 +2,7 @@
 title: Hacking on systemd
 category: Contributing
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Hacking on systemd

docs/HOME_DIRECTORY.md

@@ -2,6 +2,7 @@
 title: Home Directories
 category: Users, Groups and Home Directories
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Home Directories

docs/INITRD_INTERFACE.md

@@ -2,6 +2,7 @@
 title: Initrd Interface
 category: Interfaces
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 

docs/JOURNAL_FILE_FORMAT.md

@@ -2,6 +2,7 @@
 title: Journal File Format
 category: Interfaces
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Journal File Format

docs/JOURNAL_NATIVE_PROTOCOL.md

@@ -2,6 +2,7 @@
 title: Native Journal Protocol
 category: Interfaces
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Native Journal Protocol

docs/PASSWORD_AGENTS.md

@@ -2,6 +2,7 @@
 title: Password Agents
 category: Interfaces
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Password Agents

docs/PORTABILITY_AND_STABILITY.md

@@ -2,6 +2,7 @@
 title: Interface Portability and Stability
 category: Interfaces
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Interface Portability and Stability Promise

docs/PORTABLE_SERVICES.md

@@ -2,6 +2,7 @@
 title: Portable Services Introduction
 category: Concepts
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Portable Services Introduction

docs/PREDICTABLE_INTERFACE_NAMES.md

@@ -2,6 +2,7 @@
 title: Predictable Network Interface Names
 category: Concepts
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Predictable Network Interface Names

docs/RANDOM_SEEDS.md

@@ -2,6 +2,7 @@
 title: Random Seeds
 category: Concepts
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Random Seeds

docs/RELEASE.md

@@ -2,6 +2,7 @@
 title: Steps to a Successful Release
 category: Contributing
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Steps to a Successful Release

docs/RESOLVED-VPNS.md

@@ -2,6 +2,7 @@
 title: systemd-resolved and VPNs
 category: Networking
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # `systemd-resolved.service` and VPNs

docs/ROOT_STORAGE_DAEMONS.md

@@ -2,6 +2,7 @@
 title: Storage Daemons for the Root File System
 category: Interfaces
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # systemd and Storage Daemons for the Root File System

docs/SECURITY.md

@@ -2,6 +2,7 @@
 title: Reporting of Security Vulnerabilities
 category: Contributing
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Reporting of Security Vulnerabilities

docs/TEMPORARY_DIRECTORIES.md

@@ -2,6 +2,7 @@
 title: Using /tmp/ and /var/tmp/ Safely
 category: Interfaces
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Using `/tmp/` and `/var/tmp/` Safely

docs/TESTING_WITH_SANITIZERS.md

@@ -2,6 +2,7 @@
 title: Testing systemd Using Sanitizers
 category: Contributing
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Testing systemd Using Sanitizers

docs/TRANSIENT-SETTINGS.md

@@ -2,6 +2,7 @@
 title: What Settings Are Currently Available For Transient Units?
 category: Interfaces
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # What Settings Are Currently Available For Transient Units?

docs/TRANSLATORS.md

@@ -2,6 +2,7 @@
 title: Notes for Translators
 category: Contributing
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Notes for Translators

docs/UIDS-GIDS.md

@@ -2,6 +2,7 @@
 title: Users, Groups, UIDs and GIDs on systemd Systems
 category: Users, Groups and Home Directories
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # Users, Groups, UIDs and GIDs on systemd Systems

docs/USERDB_AND_DESKTOPS.md

@@ -2,6 +2,7 @@
 title: systemd-homed and JSON User/Group Record Support in Desktop Environments
 category: Users, Groups and Home Directories
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # `systemd-homed` and JSON User/Group Record Support in Desktop Environments

docs/USER_GROUP_API.md

@@ -2,6 +2,7 @@
 title: User/Group Record Lookup API via Varlink
 category: Users, Groups and Home Directories
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # User/Group Record Lookup API via Varlink

docs/USER_NAMES.md

@@ -2,6 +2,7 @@
 title: User/Group Name Syntax
 category: Users, Groups and Home Directories
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # User/Group Name Syntax

docs/USER_RECORD.md

@@ -2,6 +2,7 @@
 title: JSON User Records
 category: Users, Groups and Home Directories
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 # JSON User Records

docs/index.md

@@ -1,5 +1,6 @@
 ---
 layout: default
+SPDX-License-Identifier: LGPL-2.1-or-later
 ---
 
 systemd is a suite of basic building blocks for a Linux system. It provides a system and service manager that runs as PID 1 and starts the rest of the system.