Update build_containers.yml

Extend the usage of the docker actions to support tagging using the version tagging on the repo

.github/workflows/build_containers.yml

@@ -1,5 +1,8 @@
 name: build and publish containers
-on: workflow_dispatch
+on:
+  push:
+    tags:
+      - v*
 permissions:
   packages: write
   contents: read
@@ -9,6 +12,23 @@ jobs:
     steps:
       - name: check out the repo
         uses: actions/checkout@v4
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          # list of Docker images to use as base name for tags
+          images: |
+            openchami/local-ca
+            ghcr.io/openchami/local-ca            
+          # generate Docker tags based on the following events/attributes
+          tags: |
+            type=schedule
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=sha    
       - name: setup Docker Buildx
         uses: docker/setup-buildx-action@v3
       - name: Login to github container repo
@@ -17,9 +37,10 @@ jobs:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
-      - name: build+push
+      - name: Build and push
         uses: docker/build-push-action@v5
         with:
-          context: "{{defaultContext}}:local-ca"
-          push: true
-          tags: ghcr.io/openchami/local-ca:acme
+          context: .
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}