docker image tagger

.github/workflows/docker-build-n-push.yml

@@ -4,6 +4,9 @@ on:
   push:
     branches: [current, test]
 
+env:
+  image_base: ghcr.io/agicommies/subspace
+
 jobs:
   build-n-push:
     permissions: write-all
@@ -27,7 +30,7 @@ jobs:
     - name: Compute image names for commit tags
       run: |
         tags=$(git tag --contains ${{ steps.commit.outputs.short }})
-        image_names=$(<<< $tags xargs -I {} printf "ghcr.io/agicommies/subspace:{}\n")
+        image_names=$(<<< $tags xargs -I {_} printf "$image_base:{_}\n")
         echo $image_names | tee -a $GITHUB_ENV
 
     - name: Build and push
@@ -36,5 +39,5 @@ jobs:
         context: .
         push: true
         tags: |
-          ghcr.io/agicommies/subspace:${{ steps.commit.outputs.short }}
-          ghcr.io/agicommies/subspace:${{ github.head_ref || github.ref_name }}
+          $image_base:${{ steps.commit.outputs.short }}
+          $image_base:${{ github.head_ref || github.ref_name }}

.github/workflows/docker-retag.yml

@@ -0,0 +1,29 @@
+on:
+  push:
+    tags: ["*"]
+
+env:
+  image_base: ghcr.io/agicommies/subspace
+
+jobs:
+  tag-docker-image:
+    permissions: write-all
+    runs-on: ubuntu-latest
+    env:
+      image_of_commit: $image_base:${{ steps.commit.outputs.short }}
+    steps:
+      - name: Docker Login
+        uses: docker/[email protected]
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Checks if docker image is on registry
+        run: |
+          image_exists_check=$(docker manifest inspect "$image_of_commit" > /dev/null 2>&1; echo $?)
+
+          if [ $image_exists_check -eq 0 ]; then
+            echo "Image exists. Tagging with `${{ github.ref_name }}`"
+            docker buildx imagetools create "$image_of_commit" --tag "$image_base:${{ github.ref_name }}"
+          fi