Added PGP Key for Helm provenance

.github/workflows/release-publish.yml

@@ -27,6 +27,11 @@ jobs:
           git config user.name "$GITHUB_ACTOR"
           git config user.email "[email protected]"
 
+      - name: Import PGP Private Key
+        run: |
+          echo "${{ secrets.PGP_PRIVATE_KEY }}" | gpg --dearmor --output keyring.gpg
+          echo "${{ secrets.PGP_KEY_PASSPHRASE }}" > passphrase-file.txt
+
       - name: Set up Helm
         uses: azure/setup-helm@29960d0f5f19214b88e1d9ba750a9914ab0f1a2f # v4.0.0
         with:
@@ -36,6 +41,10 @@ jobs:
         uses: helm/chart-releaser-action@a917fd15b20e8b64b94d9158ad54cd6345335584 # v1.6.0
         env:
           CR_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+          CR_KEY: [email protected]
+          CR_KEYRING: keyring.gpg
+          CR_PASSPHRASE_FILE: passphrase-file.txt
+          CR_SIGN: true
           CR_SKIP_EXISTING: true
           CR_GENERATE_RELEASE_NOTES: true
           CR_RELEASE_NAME_TEMPLATE: "{{ .Name }}-v{{ .Version }}"