Add automatic TER release

.github/workflows/release.yml

@@ -0,0 +1,41 @@
+name: TER release
+
+on:
+  push:
+    tags:
+      - 'v[0-9]+.[0-9]+.[0-9]+'
+
+jobs:
+  release:
+    name: TYPO3 TER release
+
+    if: startsWith(github.ref, 'refs/tags/')
+
+    runs-on: ubuntu-20.04
+
+    env:
+      TYPO3_API_TOKEN: ${{ secrets.TYPO3_API_TOKEN }}
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Get version
+        id: get-version
+        run: echo ::set-output name=version::$(echo "${{ github.event.ref }}" | cut -d 'v' -f 2)
+
+      - name: Get comment
+        id: get-comment
+        run: echo ::set-output name=comment::Released version ${{ steps.get-version.outputs.version }}. Check changelog in documentation on github for more information.
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 7.4
+          extensions: intl, mbstring, json, zip, curl
+
+      - name: Install tailor
+        run: composer global require typo3/tailor --prefer-dist --no-progress
+
+      - name: Publish to TER
+        run: php ~/.composer/vendor/bin/tailor ter:publish --comment "${{ steps.get-comment.outputs.comment }}" ${{ steps.get-version.outputs.version }}