fix: re-add actions and login

Author: samrose

.github/workflows/dockerhub-release-matrix.yml

@@ -130,6 +130,11 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - uses: DeterminateSystems/nix-installer-action@main
+      - uses: docker/setup-buildx-action@v3
+      - uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
       - name: Get image tag
         id: get_version
         run: |