chore: Clone submodules in clusterfuzzlite Dockerfile.

Needed for the build afterwards.

.clusterfuzzlite/Dockerfile

@@ -21,5 +21,6 @@ WORKDIR $SRC
 COPY . $SRC/c-toxcore
 # Working directory for build.sh.
 WORKDIR $SRC/c-toxcore
+RUN git submodule update --init --recursive
 # Copy build.sh into $SRC dir.
 COPY ./.clusterfuzzlite/build.sh $SRC/

.github/workflows/docker.yml

@@ -49,6 +49,28 @@ jobs:
           cache-from: type=registry,ref=toxchat/bootstrap-node:latest-websocket
           cache-to: type=inline
 
+  docker-clusterfuzz:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Login to DockerHub
+        if: ${{ github.event_name == 'push' }}
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: "."
+          file: .clusterfuzzlite/Dockerfile
+          push: ${{ github.event_name == 'push' }}
+          tags: toxchat/c-toxcore:clusterfuzz
+          cache-from: type=registry,ref=toxchat/c-toxcore:clusterfuzz
+          cache-to: type=inline
+
   docker-fuzzer:
     runs-on: ubuntu-latest
     steps: