Update parallel_tests.yml

.github/workflows/parallel_tests.yml

@@ -50,6 +50,23 @@ jobs:
       - uses: actions/checkout@v4 # Clones to $GITHUB_WORKSPACE. NOTE: this requires git > 2.18 (not on ubuntu 18.04 by default) to get .git directory
         with:
           fetch-depth: 0
+      - name: 'Login to Github Container Registry'
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: ${{ github.workspace }}
+          tags: ghcr.io/${{ github.repository_owner }}/panda_local:${{ github.sha }}
+          target: developer
+          push: true
+      - name: Minimal test of built container # Just test to see if one of our binaries is built
+        run: docker run --rm "ghcr.io/${{ github.repository_owner }}/panda_local:${{ github.sha }}" /bin/bash -c 'exit $(/panda/build/arm-softmmu/panda-system-arm -help | grep -q "usage. panda-system-arm")'
 
   tests:
     if: github.repository  == 'panda-re/panda'