ci: add release CI

.github/workflows/main.yml

@@ -0,0 +1,30 @@
+name: Tag a new seat-docker release
+on:
+  release:
+    types: [released]
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  build:
+    name: Checkout and tag
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          repository: eveseat/seat-docker
+          ssh-key: '${{ secrets.SEAT_DOCKER_REPO }}'
+      - run: |
+          git config user.name github-actions
+          git config user.email [email protected]
+          currver=`cat version`
+          a=(${currver//./ })
+          newrelease=${a[2]}
+          newrelease=$((newrelease+1))
+          newver="${a[0]}.${a[1]}.${newrelease}"
+          echo $newver > version
+          git add version
+          git commit -m "bump to version $newver"
+          git push
+          git tag -a "$newver" -m "src: $GITHUB_REPOSITORY commit: ${GITHUB_SHA: -8}"
+          git push origin --tags