Merge pull request #442 from Gontier-Julien/docker-buildx

Use docker buildx, since docker build is deprecated.

.github/workflows/container.yml

@@ -45,7 +45,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Build image
-        run: docker build . --file Dockerfile --tag $IMAGE_NAME --label "runnumber=${GITHUB_RUN_ID}"
+        run: docker buildx build . --file Dockerfile --tag $IMAGE_NAME --label "runnumber=${GITHUB_RUN_ID}"
       - name: Log in to registry
         run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin
       - name: Push image