Fix release flow 2 (#427)

* fix: use pull_request_target so release assistant works on fork PRs

* fix: add GH_REPO env var for gh CLI without git repo

Author: doron050

.github/workflows/release-assistant.yml

@@ -21,6 +21,7 @@ jobs:
         id: analysis
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_REPO: ${{ github.repository }}
           PR_NUMBER: ${{ github.event.pull_request.number }}
         run: |
           CHANGED_FILES=$(gh pr view ${{ env.PR_NUMBER }} --json files --jq '.files[].path' | tr '\n' ' ')