run only on external prs

.github/workflows/test.yml

@@ -25,6 +25,11 @@ jobs:
           echo "publish_url=$publish_url"
 
   build-sdist:
+    # Run on external PRs, but not on internal PRs, to avoid duplicate runs
+    if: |
+      github.event_name == 'push' ||
+      github.event.pull_request.head.repo.full_name != github.repository
+
     name: Build source distribution
     runs-on: ubuntu-latest
     steps:
@@ -69,13 +74,6 @@ jobs:
   build-with-conda:
     name: Test with conda
     needs: build-sdist
-    # We want to run on external PRs, but not on our own internal PRs as they'll be run
-    # by the push to the branch. Without this if check, checks are duplicated since
-    # internal PRs match both the push and pull_request events.
-    if:
-      github.event_name == 'push' || github.event.pull_request.head.repo.full_name !=
-      github.repository
-
     runs-on: ${{ matrix.os }}
 
     defaults: