fix: allow workflow_dispatch to trigger release.yml (#637)

Signed-off-by: Ian Lewis <ianlewis@google.com>

.github/workflows/release.yml

@@ -59,7 +59,7 @@ jobs:
   verification:
     needs: [builder]
     runs-on: ubuntu-latest
-    if: github.event_name != 'schedule'
+    if: github.event_name != 'schedule' && github.event_name != 'workflow_dispatch'
     permissions: read-all
     steps:
       - name: Install the verifier