ci(release): don't run release-please workflow in forks (weaveworks#4845)

Author: erikgb

.github/workflows/release-please.yaml

@@ -13,6 +13,7 @@ permissions:
 jobs:
   release-please:
     runs-on: ubuntu-latest
+    if: "${{ github.repository_owner == 'weaveworks' && github.ref_name == 'main'}}"
     steps:
       - id: release
         uses: googleapis/release-please-action@a02a34c4d625f9be7cb89156071d8567266a2445 # v4.2.0