Enable QEMU and Docker Buildx in release action

Signed-off-by: Hidde Beydals <hello@hidde.co>

.github/workflows/release.yaml

@@ -16,6 +16,26 @@ jobs:
         uses: actions/setup-go@v2
         with:
           go-version: 1.16.x
+      - name: Setup QEMU
+        uses: docker/setup-qemu-action@v1
+        with:
+          platforms: all
+      - name: Setup Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+        with:
+          buildkitd-flags: "--debug"
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: fluxcdbot
+          password: ${{ secrets.GHCR_TOKEN }}
+      - name: Login to Docker Hub
+        uses: docker/login-action@v1
+        with:
+          username: fluxcdbot
+          password: ${{ secrets.DOCKER_FLUXCD_PASSWORD }}
       - name: Download release notes utility
         env:
           GH_REL_URL: https://github.com/buchanae/github-release-notes/releases/download/0.2.0/github-release-notes-linux-amd64-0.2.0.tar.gz