attempt to re-enable docker layer cache

.github/workflows/containers.yml

@@ -94,13 +94,12 @@ jobs:
       - name: Image digest
         run: echo step SHA ${{ steps.vars.outputs.sha_short }} tag ${{steps.vars.outputs.tag}} branch ${{steps.vars.outputs.branch}} digest ${{ steps.docker_build.outputs.digest }}
 
-# failed: Cache service responded with 503
+      - name: Cache Docker layers
-#      - name: Cache Docker layers
+        uses: actions/cache@v2
-#        uses: actions/cache@v2
+        with:
-#        with:
+          path: /tmp/.buildx-cache
-#          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
-#          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
-#          restore-keys: |
+            ${{ runner.os }}-buildx-
-#            ${{ runner.os }}-buildx-