workflows/eval: prevent tag job from failing in forks

.github/workflows/eval.yml

@@ -209,7 +209,7 @@ jobs:
         run: nix-build base/ci -A requestReviews
 
       - name: Labelling pull request
-        if: ${{ github.event_name == 'pull_request_target' }}
+        if: ${{ github.event_name == 'pull_request_target' && github.repository_owner == 'NixOS' }}
         run: |
           # Get all currently set rebuild labels
           gh api \
@@ -244,7 +244,7 @@ jobs:
           NUMBER: ${{ github.event.number }}
 
       - name: Add eval summary to commit statuses
-        if: ${{ github.event_name == 'pull_request_target' }}
+        if: ${{ github.event_name == 'pull_request_target' && github.repository_owner == 'NixOS' }}
         run: |
           description=$(jq -r '
           "Package: added " + (.attrdiff.added | length | tostring) +
@@ -264,7 +264,7 @@ jobs:
           NUMBER: ${{ github.event.number }}
 
       - name: Requesting maintainer reviews
-        if: steps.app-token.outputs.token
+        if: ${{ steps.app-token.outputs.token && github.repository_owner == 'NixOS' }}
         run: |
           # maintainers.json contains GitHub IDs. Look up handles to request reviews from.
           # There appears to be no API to request reviews based on GitHub IDs