chore: Build a docker image with coverage info in it.

We can then use that to build a coverage web UI on render.com using the
Dockerfile.nginx build.

.github/workflows/post-submit.yml

@@ -9,8 +9,35 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
+        uses: docker/setup-buildx-action@v3
       - name: Docker Build
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v4
         with:
           file: other/docker/alpine-s390x/Dockerfile
+
+  docker-coverage:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+        with:
+          driver: docker
+      - name: Login to DockerHub
+        if: ${{ github.event_name == 'push' }}
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Build toxchat/c-toxcore:sources
+        uses: docker/build-push-action@v4
+        with:
+          file: other/docker/sources/Dockerfile
+          tags: toxchat/c-toxcore:sources
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          file: other/docker/coverage/Dockerfile
+          push: ${{ github.event_name == 'push' }}
+          tags: toxchat/c-toxcore:coverage
+          cache-from: type=registry,ref=toxchat/c-toxcore:coverage
+          cache-to: type=inline

.github/workflows/sonar-scan.yml

@@ -19,13 +19,14 @@ jobs:
       SONAR_SERVER_URL: "https://sonarcloud.io"
       BUILD_WRAPPER_OUT_DIR: build_wrapper_output_directory # Directory where build-wrapper output will be placed
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
           submodules: recursive
       - name: Set up JDK 17
-        uses: actions/setup-java@v1
+        uses: actions/setup-java@v2
         with:
+          distribution: "zulu"
           java-version: 17
       - name: Download and set up sonar-scanner
         env: