fix: do not run release workflow on forks

Signed-off-by: Terry Howe <terrylhowe@gmail.com>

.github/workflows/release.yml

@@ -16,7 +16,7 @@ permissions: read-all
 #   job is triggered by a tag push, VERSION should be the tag ref.
 jobs:
   release:
-    if: startsWith(github.ref, 'refs/tags/v')
+    if: startsWith(github.ref, 'refs/tags/v') && github.repository == 'helm/helm'
     runs-on: ubuntu-latest-16-cores
     steps:
       - name: Checkout source code
@@ -76,7 +76,7 @@ jobs:
 
   canary-release:
     runs-on: ubuntu-latest-16-cores
-    if: github.ref == 'refs/heads/main'
+    if: github.ref == 'refs/heads/main' && github.repository == 'helm/helm'
     steps:
       - name: Checkout source code
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # pin@v5.0.0