Add workflows documentation

Co-authored-by: squassina <8495707+squassina@users.noreply.github.com>

.github/workflows/README.md

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+# GitHub Actions Workflows
+
+This directory contains the GitHub Actions workflows for the MangoWC project.
+
+## Workflows
+
+### build.yml
+**Purpose**: Builds the project to ensure code changes compile successfully.
+
+**Triggers**:
+- Push to `main` or `master` branch
+- Pull requests to `main` or `master` branch
+- Manual dispatch (workflow_dispatch)
+
+**What it does**:
+1. Installs system dependencies (wayland, libinput, etc.)
+2. Builds wlroots 0.19 from source
+3. Builds scenefx 0.4 from source
+4. Configures the project with meson
+5. Builds the project with ninja
+6. Verifies the executables were created
+
+**Dependencies**:
+- Ubuntu latest runner
+- Meson build system
+- Ninja build tool
+- Wayland ecosystem libraries
+- wlroots 0.19
+- scenefx 0.4
+
+### lock.yml
+**Purpose**: Automatically locks inactive issues and PRs to keep the repository clean.
+
+**Triggers**:
+- Scheduled daily at 12:30 UTC
+- Manual dispatch
+
+**What it does**:
+- Locks issues, PRs, and discussions that have been closed for 30 days
+- Adds a comment explaining why the thread was locked
+
+### stale.yml
+**Purpose**: Automatically closes issues that have been manually marked as stale.
+
+**Triggers**:
+- Scheduled daily at 12:30 UTC
+
+**What it does**:
+- Closes issues marked with the "stale" label after 7 days of inactivity
+- Adds "automatic-closing" label when closing
+- Does not automatically mark issues as stale (only processes manually marked ones)
+
+## Development Notes
+
+The build workflow ensures that:
+- All dependencies are properly installed
+- The project compiles without errors
+- Both main executables (`mango` and `mmsg`) are built successfully
+
+If the build workflow fails, check:
+1. Dependencies are up to date in the workflow file
+2. wlroots and scenefx versions match requirements in meson.build
+3. Build configuration in meson.build hasn't changed