Fix/refine-tagging-logic (#21)

* fix: refine tagging logic

* feat: verify tag with semver

* fix: set-output deprecated

* fix: also use new envs

.github/workflows/docker-build.yml

@@ -11,18 +11,28 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Check Version Format in Tag
+        if: startsWith(github.ref, 'refs/tags/v')
+        uses: nowsprinting/check-version-format-action@v4.0.2
+        id: check-version
+        with:
+          prefix: 'v'
+
       - name: Set tag
         id: set-tag
         run: |
           SHORT_SHA=$(git rev-parse --short HEAD)
-          if [[ "${{ github.ref }}" == "refs/heads/main" ]]; then
-            echo "::set-output name=tag1::latest"
-            echo "::set-output name=tag2::commit-$SHORT_SHA"
-          else
-            echo "::set-output name=tag1::dev"
-            echo "::set-output name=tag2::commit-$SHORT_SHA"
+          TAG1="dev"
+          TAG2="commit-$SHORT_SHA"
+
+          if [[ "${{ steps.check-version.outputs.is_valid }}" == 'true' ]]; then
+            TAG1="latest"
+            TAG2="${{ steps.check-version.outputs.full_without_prefix }}"
           fi
 
+          echo "TAG1=$TAG1" >> $GITHUB_ENV
+          echo "TAG2=$TAG2" >> $GITHUB_ENV
+
       - name: Docker meta
         id: meta
         uses: docker/metadata-action@v5
@@ -31,8 +41,8 @@ jobs:
             mtr.devops.telekom.de/caas/py-kube-downscaler
             ghcr.io/caas-team/py-kube-downscaler
           tags: |
-            ${{ steps.set-tag.outputs.tag1 }}
-            ${{ steps.set-tag.outputs.tag2 }}
+            ${{ env.TAG1 }}
+            ${{ env.TAG2 }}
 
       - name: Install Cosign
         uses: sigstore/cosign-installer@main