Add Docker CI cache

.github/workflows/CI.yml

@@ -34,6 +34,14 @@ jobs:
     - name: Set up Docker Buildx
       uses: docker/[email protected]
 
+    - name: Cache Docker layers
+      uses: actions/[email protected]
+      with:
+        path: /tmp/.buildx-cache
+        key: ${{ runner.os }}-buildx-${{ github.sha }}
+        restore-keys: |
+          ${{ runner.os }}-buildx-
+
     - name: Log in to Docker Hub
       if: github.ref == 'refs/heads/master'
       uses: docker/[email protected]
@@ -49,4 +57,6 @@ jobs:
         platforms: ${{ env.DOCKER_PLATFORMS }}
         push: ${{ github.ref == 'refs/heads/master' }}
         tags: ${{ env.DOCKER_IMAGE }}:${{ matrix.branch }}
-        build-args: ${{ matrix.build-args }}
+        build-args: ${{ matrix.build-args }}
+        cache-from: type=local,src=/tmp/.buildx-cache
+        cache-to: type=local,dest=/tmp/.buildx-cache