Merge pull request #385 from slauger/fix/cosign-chart-auth

fix: add cosign registry login for Helm chart signing

Author: slauger

.github/workflows/release.yaml

@@ -113,7 +113,9 @@ jobs:
         uses: sigstore/cosign-installer@v4.1.2
 
       - name: Login to ghcr.io
-        run: echo "${{ github.token }}" | helm registry login ghcr.io -u ${{ github.actor }} --password-stdin
+        run: |
+          echo "${{ github.token }}" | helm registry login ghcr.io -u ${{ github.actor }} --password-stdin
+          echo "${{ github.token }}" | cosign login ghcr.io -u ${{ github.actor }} --password-stdin
 
       - name: Inject version into Chart.yaml
         run: |