Ensure running on pull request

Author: koppor

.github/workflows/check-links.yaml

@@ -7,6 +7,7 @@ on:
       - '.lycheeignore'
       - 'lychee.toml'
       - '**/*.md'
+  pull_request:
   schedule:
     # Run on the first of each month at 9:00 AM (See https://pubs.opengroup.org/onlinepubs/9699919799/utilities/crontab.html#tag_20_25_07)
     - cron: "0 9 1 * *"
@@ -34,4 +35,4 @@ jobs:
         uses: lycheeverse/[email protected]
         with:
           fail: true
-          args: --accept '200,201,202,203,204,403,429,500' --max-concurrency 1 --cache --no-progress --exclude-all-private './**/*.md'
+          args: --accept '200,201,202,203,204,403,429,500' --max-concurrency 1 --cache --no-progress --exclude-all-private './**/*.md'