#7: Docker build command

+ typo fixed

docker/action.yaml

@@ -0,0 +1,23 @@
+name: build & push
+description: build & push OCI container images to the Gitea registry
+
+inputs:
+  name:
+    description: image name
+    required: true
+  tags:
+    description: newline-separated list of tags to tag the image
+    required: true
+
+runs:
+  using: composite
+  steps:
+    - shell: bash
+      run: |
+        docker login --username acti-bot --password ${ACTI_BOT_TOKEN} ${{ gitea.server_url }}
+        while IFS= read -r tag; do
+          [[ -z "$tag" ]] && continue
+
+          docker build -f Containerfile -t "${{ gitea.server_url }}/${{ gitea.repository }}/${{ inputs.name }}:$tag"
+          docker push "${{ gitea.server_url }}/${{ gitea.repository }}/${{ inputs.name }}:$tag"
+        done <<< "${{ inputs.tags }}"