ci: add release workflow with release-please

Adds a release-please-driven workflow on push to main: opens a release
PR with version bumps and a generated CHANGELOG, creates the GitHub
release and tag on merge, then builds a self-installable plugin zip
and attaches it as a release asset.

- release-please-config.json + .release-please-manifest.json track
  the version. plugin.php gets release-please block markers around
  the Version: header so the generic updater bumps it (block style
  rather than inline so WP's plugin header parser doesn't capture
  the marker into the version string).
- Release zip is built via `git archive` filtered through
  .gitattributes (export-ignore for tests, agent docs, dev configs,
  etc.), with a copy of vendor/ from `composer install --no-dev
  --optimize-autoloader --classmap-authoritative`.
- plugin.php has a `// @bundle-autoload` marker that's sed-replaced
  with `require_once __DIR__ . '/vendor/autoload.php';` only in the
  release zip, so the source stays clean for Composer-managed
  installs (Bedrock-style) while the zip works as a drop-in plugin
  for vanilla WP.
- Tags are emitted without the `v` prefix.

Author: nlemoine

.gitattributes

@@ -0,0 +1,15 @@
+# Files and directories to omit from `git archive` output (release zips).
+# Anything tracked but not needed at runtime in a distributed plugin.
+
+/.claude              export-ignore
+/.github              export-ignore
+/.gitattributes       export-ignore
+/.gitignore           export-ignore
+/.release-please-manifest.json  export-ignore
+/assets               export-ignore
+/docs                 export-ignore
+/package.json         export-ignore
+/pnpm-lock.yaml       export-ignore
+/release-please-config.json     export-ignore
+/tests                export-ignore
+/*.dist               export-ignore

.github/workflows/release.yml

@@ -0,0 +1,69 @@
+name: Release
+
+on:
+  push:
+    branches:
+      - main
+
+permissions: {}
+
+concurrency:
+  group: release-${{ github.ref }}
+  cancel-in-progress: false
+
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    permissions:
+      contents: write
+      pull-requests: write
+    outputs:
+      release_created: ${{ steps.rp.outputs.release_created }}
+      tag_name: ${{ steps.rp.outputs.tag_name }}
+      version: ${{ steps.rp.outputs.version }}
+    steps:
+      - id: rp
+        uses: googleapis/release-please-action@45996ed1f6d02564a971a2fa1b5860e934307cf7  # v5.0.0
+
+  build:
+    needs: release-please
+    if: needs.release-please.outputs.release_created == 'true'
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v6
+
+      - uses: shivammathur/setup-php@accd6127cb78bee3e8082180cb391013d204ef9f  # 2.37.0
+        with:
+          php-version: '8.2'
+          coverage: none
+
+      - uses: ramsey/composer-install@65e4f84970763564f46a70b8a54b90d033b3bdda  # 4.0.0
+        with:
+          composer-options: '--no-dev --optimize-autoloader --classmap-authoritative'
+
+      - name: Build release zip
+        env:
+          VERSION: ${{ needs.release-please.outputs.version }}
+        run: |
+          mkdir -p dist
+          # Tracked files only, with .gitattributes export-ignore filtering applied.
+          git archive --prefix=page-for-custom-post-type/ HEAD | tar -x -C dist
+          # vendor/ is gitignored, so git archive doesn't include it. Copy it in.
+          cp -r vendor dist/page-for-custom-post-type/vendor
+          # Inject the bundled-only autoload require.
+          sed -i "s|// @bundle-autoload|require_once __DIR__ . '/vendor/autoload.php';|" dist/page-for-custom-post-type/plugin.php
+          grep -q "require_once __DIR__ . '/vendor/autoload.php';" dist/page-for-custom-post-type/plugin.php \
+            || { echo "::error::bundle autoload marker replacement failed"; exit 1; }
+          php -l dist/page-for-custom-post-type/plugin.php
+          (cd dist && zip -rq "../page-for-custom-post-type-${VERSION}.zip" page-for-custom-post-type)
+
+      - name: Upload zip to release
+        env:
+          GH_TOKEN: ${{ github.token }}
+          TAG: ${{ needs.release-please.outputs.tag_name }}
+          VERSION: ${{ needs.release-please.outputs.version }}
+        run: gh release upload "$TAG" "page-for-custom-post-type-${VERSION}.zip" --clobber

.release-please-manifest.json

@@ -0,0 +1,3 @@
+{
+	".": "0.5.0"
+}

plugin.php

@@ -4,7 +4,9 @@
  * Plugin Name: Page for custom post type
  * Plugin URI: https://github.com/nlemoine/page-for-custom-post-type
  * Description: Allows you to set pages for any custom post type archive
+ * x-release-please-start-version
  * Version: 0.5.0
+ * x-release-please-end
  * Author: Nicolas Lemoine
  * Author URI: https://n5s.dev/
  * Requires PHP: 8.2
@@ -14,13 +16,13 @@
 
 namespace n5s\PageForCustomPostType;
 
-use n5s\PageForCustomPostType\Integration\IntegrationInterface;
-
 // Prevent direct access
-if (!defined('ABSPATH')) {
+if (!\defined('ABSPATH')) {
     exit;
 }
 
+// @bundle-autoload
+
 // Load translations on init (plugin is not on wordpress.org, so the
 // auto-loading introduced in WP 4.6 doesn't apply).
 add_action('init', static function (): void {

release-please-config.json

@@ -0,0 +1,17 @@
+{
+	"$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json",
+	"include-v-in-tag": false,
+	"packages": {
+		".": {
+			"release-type": "node",
+			"package-name": "page-for-custom-post-type",
+			"include-component-in-tag": false,
+			"extra-files": [
+				{
+					"type": "generic",
+					"path": "plugin.php"
+				}
+			]
+		}
+	}
+}