Push only if image test succeeds

.docker/release/Dockerfile

@@ -1,3 +1,5 @@
+# syntax=docker/dockerfile:1
+
 FROM alpine:3.15 AS builder
 RUN apk add --no-cache php7 php7-json php-phar php-zip
 RUN apk add --no-cache npm

.docker/release/test/build.sh

@@ -1,3 +0,0 @@
-#!/bin/sh
-set -eu
-docker build -t snappymail/snappymail:test -f .docker/release/Dockerfile .

.docker/release/test/build_and_test.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+# This script uses docker buildx to build a docker image, and loads it into the docker daemon. Then it executes ./test.sh to test the docker image
+# It is useful for testing release builds in development
+set -eu
+IMAGE=snappymail/snappymail:test
+DOCKER_BUILDX=1 docker buildx build --progress plain --load -t "$IMAGE" -f .docker/release/Dockerfile .
+.docker/release/test/test.sh "$IMAGE"

.docker/release/test/test.sh

@@ -1,10 +1,9 @@
 #!/bin/sh
 # This script tests a given docker image using https://github.com/GoogleContainerTools/container-structure-test
 set -eu
-
-IMAGE=${1:-snappymail/snappymail:test}
 SCRIPT_DIR=$( cd "$(dirname "$0")" && pwd )
-docker inspect "$IMAGE" > /dev/null 2>&1 || docker pull "$IMAGE" # Pull the image if it doesn't exist in docker daemon
+IMAGE=${1:-}
+echo "Testing image: $IMAGE"
 docker run --rm -i \
     -v /var/run/docker.sock:/var/run/docker.sock:ro \
     -v "$SCRIPT_DIR/config.yaml:/config.yaml:ro" \

.github/workflows/docker.yml

@@ -79,6 +79,30 @@ jobs:
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}
 
+    # See: https://github.com/docker/buildx/issues/59
+    - name: Build
+      id: build
+      uses: docker/build-push-action@v3
+      with:
+        context: '.'
+        file: ./.docker/release/Dockerfile
+        platforms: linux/amd64
+        push: false
+        load: true
+        tags: ${{ steps.meta.outputs.tags }}
+        labels: ${{ steps.meta.outputs.labels }}
+        cache-from: type=local,src=/tmp/.buildx-cache
+        cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max
+
+    - name: Docker images
+      run: |
+        docker images
+
+    - name: Test
+      run: |
+        TAG=$( echo "${{ steps.meta.outputs.tags }}" | head -n1 )
+        .docker/release/test/test.sh "$TAG"
+
     - name: Build and push
       id: build-and-push
       uses: docker/build-push-action@v3
@@ -94,11 +118,6 @@ jobs:
         cache-from: type=local,src=/tmp/.buildx-cache
         cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max
 
-    - name: Test
-      run: |
-        TAG=$( echo "${{ steps.meta.outputs.tags }}" | head -n1 )
-        .docker/release/test/test.sh "$TAG"
-
     # Temp fix
     # https://github.com/docker/build-push-action/issues/252
     # https://github.com/moby/buildkit/issues/1896