Fetch last passing daily build before rebuilding (infra) (#1165)

* Fetch last passing daily build before rebuilding

* Actually do the selection with ==

* Document what the wall of jq queries are doing

.github/workflows/daily-builds.yml

@@ -17,8 +17,16 @@ jobs:
  fetch-depth: 0
  - name: Check for commits
  id: commit_check
+ env:
+ GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
  run: |
- commit_count=$(git log --since="24 hours ago" --oneline -- checkbox-ng checkbox-support providers checkbox-core-snap checkbox-snap | wc -l)
+ # get the last daily build that passed by
+ # 1. getting all workflows that are daily builds (path == ...)
+ # 2. removing those that did not result in success
+ # 3. selecting the date/time they started at (format: %Y-%m-%dT%H:%M:%sZ)
+ # 4. removing the Z postfix from the date to make it usable by git directly
+ export LAST_PASS_DAILY_BUILD=`gh api repos/canonical/checkbox/actions/runs --paginate --jq '.workflow_runs[] | select(.path == ".github/workflows/daily-builds.yml") | select(.conclusion == "success") | .run_started_at | .[:-1]' | head -1`
+ commit_count=$(git log --since="$LAST_PASS_DAILY_BUILD" --oneline -- checkbox-ng checkbox-support providers checkbox-core-snap checkbox-snap | wc -l)
  echo "new_commit_count=$commit_count" | tee $GITHUB_OUTPUT
 
  checkbox-core-snap-daily: