Add workflow to use versioned images (#72)

Author: smola

.github/workflows/docker-tag.yml

@@ -0,0 +1,25 @@
+name: Tag new images version
+on:
+  schedule:
+    # Quarterly schedule, roughly aligned with JDK CPU
+    - cron: '0 0 30 1,4,7,10 *'
+  workflow_dispatch:
+
+jobs:
+  tag-images:
+    name: Tag new images version
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # 3.3.0
+      - name: Login to ghcr.io
+        uses: docker/login-action@f4ef78c080cd8ba55a85445d5b36e214a81df20a # 2.1.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Tag images
+        run: ./build --tag

build

@@ -203,6 +203,26 @@ function do_push() {
     done
 }
 
+function do_tag() {
+    local tag token version
+    TAG_PREFIX=
+    echo "Pulling latest images"
+    for tag in base latest "${BASE_VARIANTS[@]}" "${VARIANTS[@]}"; do
+        tag="${tag,,}"
+        tag="$(image_name "${tag}")"
+        docker pull "$tag"
+    done
+    version="$(date +%y.%m)"
+    echo "Tagging version $version"
+    for tag in base latest "${BASE_VARIANTS[@]}" "${VARIANTS[@]}"; do
+        tag="${tag,,}"
+        tag="$(image_name "${tag}")"
+        new_tag="${tag/:/:v$version-}"
+        docker tag "$tag" "$new_tag"
+        docker push "$new_tag"
+    done
+}
+
 if [[ -z ${1:-} ]]; then
     do_build
 elif [[ ${1} = "--test" ]]; then
@@ -216,4 +236,6 @@ elif [[ ${1} = "--inner-describe" ]]; then
     do_inner_describe
 elif [[ ${1} = "--push" ]]; then
     do_push
+elif [[ ${1} = "--tag" ]]; then
+    do_tag
 fi