gha: Enable pushing to ghcr (#1411)

Author: mramotowski

.github/workflows/package-distribution.yaml

@@ -80,6 +80,14 @@ jobs:
       - name: Build umbrella charts
         run: make build-umbrella-chart
 
+      - name: Login to GitHub Container Registry
+        if: ${{ inputs.publish_binaries }}
+        uses: docker/login-action@9780b0c442fbb1117ed29e0efdff1e18412f7567 # v3.3.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
       - name: Publish umbrella charts
         if: ${{ inputs.publish_binaries }}
         run: make publish-umbrella-chart