Update Dockerfile (#28)

* Try to make it impossible to confuse arches

* Use GHA cache

.github/workflows/cibuild.yml

@@ -14,7 +14,6 @@ name: Build
 
 env:
   CONTAINER_NAME: jordemort/pleroma:${{ github.event.inputs.container_tag || 'latest' }}
-  CACHE_NAME: jordemort/pleroma:cache-unzip
   PLATFORMS: linux/amd64,linux/arm64,linux/arm/v7
   DOCKER_CLI_EXPERIMENTAL: enabled
 
@@ -25,34 +24,34 @@ jobs:
 
     steps:
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v1.2.0
+        uses: docker/setup-qemu-action@v1
 
       - name: Set up Docker Buildx
         id: buildx
-        uses: docker/setup-buildx-action@v1.7.0
+        uses: docker/setup-buildx-action@v1
 
       - name: Login to container registry
-        uses: docker/login-action@v1.14.1
+        uses: docker/login-action@v1
         with:
           username: ${{ secrets.REGISTRY_USERNAME }}
           password: ${{ secrets.REGISTRY_TOKEN }}
 
-      - uses: actions/checkout@v3.0.2
+      - uses: actions/checkout@v3
         with:
           submodules: recursive
 
-      - name: Pull cached containers
-        run: |
-          docker pull --platform "$PLATFORMS" --quiet "$CONTAINER_NAME" || true
-          docker pull --platform "$PLATFORMS" --quiet "$CACHE_NAME" || true
+      # Needed for buildx gha cache to work
+      - name: Expose GitHub Runtime
+        uses: crazy-max/ghaction-github-runtime@v1
+
 
       - name: Build and push container
         run: |
           buildx_argv=(
             --pull
-            --build-arg BUILDKIT_INLINE_CACHE=1
             --platform "$PLATFORMS"
-            --cache-from "$CONTAINER_NAME"
+            --cache-from type=gha
+            --cache-to type=gha,mode=max
             --tag "$CONTAINER_NAME"
           )
 
@@ -61,7 +60,6 @@ jobs:
           fi
 
           set -x
-          docker buildx build "${buildx_argv[@]}" --target unzip .
           docker buildx build "${buildx_argv[@]}" .
 
       - uses: sarisia/actions-status-discord@v1