Fix drainpipe-dev workflow when run as a tag (#531)

* Should always checkout main from drainpipe-dev instead of ref_name since it may not exist when run as a tag.

* Adjust repo lockdown schedule to only once a week.

* Use ref_name if it is available but fallback to using main

* Update DrainpipeDev.yml

.github/workflows/DrainpipeDev.yml

@@ -36,7 +36,7 @@ jobs:
           git branch -m ${{ github.ref_name }}
           git remote add origin [email protected]:Lullabot/drainpipe-dev.git
           git fetch origin
-          git reset --mixed origin/${{ github.ref_name }}
+          git reset --mixed origin/${{ github.ref_name }} || git reset --mixed origin/main
           git config user.name "Lullabot-Drainpipe[bot]"
           git config user.email "157769597+Lullabot-Drainpipe[bot]@users.noreply.github.com"
 

drainpipe-dev/.github/workflows/repo-lockdown.yml

@@ -6,7 +6,7 @@ on:
   pull_request_target:
     types: opened
   schedule:
-    - cron: '0 * * * *'
+    - cron: '0 0 * * 1'
 
 permissions:
   issues: write