Allow running cargo-generate workflow on workflow_dispatch anywhe…

…re (#287)

`cargo-generate.yaml` is an automated Github Action that automatically
updates the `cargo-generate` branch from `main`. It's proven to be a bit
flaky in the past, so I've found myself testing it on my fork a lot. The
issue is that this action is automatically skipped if run on a fork.
This is generally good, unless you want to test the workflow
specifically and are not an average user.

The amend this, I made the action run if on the source repository OR if
it was manually called using `workflow_dispatch`. This way, it won't run
when `main` is updated on forks, but still will let developers manually
call it if needed.

Co-authored-by: Jan Hohenheim <[email protected]>

.github/workflows/cargo-generate.yaml

@@ -23,8 +23,8 @@ permissions:
 jobs:
   update:
     runs-on: ubuntu-latest
-    # Only run this job on the source repository, skipping forks.
-    if: ${{ github.repository == 'TheBevyFlock/bevy_quickstart' }}
+    # Only run this job on the source repository, skipping forks, unless it was manually triggered.
+    if: ${{ github.repository == 'TheBevyFlock/bevy_quickstart' || github.event_name == 'workflow_dispatch' }}
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4