ci: disable CI cache

.github/workflows/main.yml

@@ -33,14 +33,6 @@ jobs:
           fi
           echo ::set-output name=tags::${TAGS}
 
-      - name: Cache Docker layers
-        uses: actions/cache@v2
-        with:
-          path: /tmp/.buildx-cache
-          key: ${{ runner.os }}-buildx-${{ github.sha }}
-          restore-keys: |
-            ${{ runner.os }}-buildx-
-
       - name: Login to Docker Hub
         uses: docker/login-action@v1
         with:
@@ -57,8 +49,6 @@ jobs:
           platforms: linux/amd64,linux/arm64,linux/arm
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.prep_zero-ui.outputs.tags }}
-          cache-from: type=local,src=/tmp/.buildx-cache
-          cache-to: type=local,dest=/tmp/.buildx-cache
 
       - name: Build and push zerotier-controller
         id: docker_build_zerotier-controller
@@ -70,5 +60,3 @@ jobs:
           platforms: linux/amd64,linux/arm64,linux/arm
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ secrets.DOCKER_HUB_USERNAME }}/zerotier-controller:latest
-          cache-from: type=local,src=/tmp/.buildx-cache
-          cache-to: type=local,dest=/tmp/.buildx-cache