add missing secret

Author: jaehyeon-kim

.github/workflows/release.yml

@@ -26,6 +26,8 @@ jobs:
           # Trust the imported key ultimately to avoid trust prompts
           KEY_ID=$(gpg --list-secret-keys --with-colons | grep '^sec' | head -n1 | cut -d':' -f5)
           echo "KEY_ID=$KEY_ID" >> $GITHUB_ENV
+        env:
+          GPG_PRIVATE_KEY: ${{ secrets.GPG_PRIVATE_KEY }}
 
       - name: Create combined GPG keyring for chart-releaser
         run: |