another rework over github action

.github/workflows/docker.yml

@@ -6,23 +6,32 @@ name: Publish Docker image
 on: push
 
 jobs:
-  push_to_registry:
-    name: Push Docker image to GitHub Packages
+  publish:
+    name: Publish Image
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
-      - name: Login to GitHub Container Registry
-        uses: docker/login-action@v1
-        with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-      - name: Build and push
-        uses: docker/build-push-action@v2
-        with:
-          context: .
-          push: true
-          tags: ghcr.io/${{ github.repository_owner }}/superalgos:latest 
+    - uses: actions/checkout@v2
+    - name: Preparation
+      id: prep
+      run: |
+        REGISTRY="docker.pkg.github.com"
+        IMAGE="${REGISTRY}/${{ github.repository }}/${{ github.event.repository.name }}"
+        TAGS="${IMAGE}:${{ github.sha }}"
+        if [[ $GITHUB_REF == ref/head/master ]]; then
+          TAGS="${TAGS},${IMAGE}:latest"
+        fi
+        echo ::set-output name=tags::${TAGS}
+    - name: Docker Buildx setup
+      uses: docker/setup-buildx-action@v1
+    - name: Login in to registry
+      uses: docker/login-action@v1
+      with:
+        registry: docker.pkg.github.com
+        username: ${{ github.actor }}
+        password: ${{ github.token }}
+    - name: Push to registry
+      uses: docker/build-push-action@v2
+      with:
+        push: true
+        file: ./Dockerfile
+        tags: ${{ steps.prep.outputs.tags }}