ci: temporarily trigger e2e-matrix.yml on pull_request for this PR's review

workflow_dispatch can't dispatch a workflow that doesn't exist on the
default branch yet -- no way to get a real execution of a brand-new
workflow_dispatch workflow before it merges any other way. pull_request
runs use the PR branch's own file content directly, so this gets a real
signal on this exact PR without needing anything on main first, and
without affecting any other already-open PR (each PR triggers off its
own branch's workflow files).

To revert before merge, restoring the intended permanent
workflow_dispatch-only state.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: sebastian-pf9

.github/workflows/e2e-matrix.yml

@@ -10,6 +10,14 @@
 name: e2e-matrix
 
 on:
+  # TEMPORARY, for this PR's own review only: workflow_dispatch can't
+  # dispatch a workflow that doesn't exist on the default branch yet, so
+  # there's no way to get a real execution of a brand-new workflow_dispatch
+  # workflow before it merges except by triggering it some other way once.
+  # Remove this pull_request trigger again before merging -- see the plan
+  # this PR is part of for why workflow_dispatch-only is the intended,
+  # permanent state.
+  pull_request: {}
   workflow_dispatch: {}
 
 permissions: