feat: skip autotag passing external tag to action (#50)

action.yml

@@ -30,6 +30,10 @@ inputs:
     default: ""
     required: false
 
+  external_tag:
+    description: "use this provided tag instead of the having the action calculate it"
+    required: false
+
   context_path:
     description: "path to context directory (where the build starts)"
     required: true
@@ -209,6 +213,7 @@ runs:
 
 # Bump version and create git tag
     - name: Bump container version and create new github tag
+      if: ${{ ! inputs.external_tag }}
       id: bump_version
       uses: mathieudutour/[email protected]
       with:
@@ -237,6 +242,7 @@ runs:
     # In some edge cases we need to prepend and/or append a string
     # See "image_tag_string_suffix" or "image_tag_string_prefix" in inputs section
     - name: Add optional suffix and-or prefix to docker image tag
+      if: ${{ ! inputs.external_tag }}
       shell: bash
       id: image_tag
       run: |
@@ -257,7 +263,7 @@ runs:
           org.opencontainers.image.title=${{ inputs.image_name }}
           org.opencontainers.image.description=${{ inputs.image_description }}
         tags: |
-          type=raw,value=${{ steps.image_tag.outputs.ver }}
+          type=raw,value=${{ inputs.external_tag || steps.image_tag.outputs.ver }}
 
     - name: Build container
       uses: docker/build-push-action@v3