docs: add more comments to workflows

Author: karfau

.github/workflows/main.yml

@@ -15,7 +15,7 @@ jobs:
           - python.json
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v5 # required for running the local validate action in the next step
       - uses: ./validator
         with:
           config: ${{ matrix.config }}

.github/workflows/trigger.yml

@@ -5,7 +5,8 @@ on:
       - trigger.ts
       - .github/workflows/trigger.yml
   schedule: # make sure renovate checks at least once an hour
-    - cron: "30 * * * *" # hourly https://crontab.guru/#0_*_*_*_*
+    # every hour at minute thirty https://crontab.guru/#30_%2A_%2A_%2A_%2A
+    - cron: "30 * * * *"
   workflow_dispatch: # trigger it for other repos from the browser
     inputs:
       repo: