Merge pull request #73 from lsst-dm/u/womullan/trigger

U/womullan/trigger

.github/workflows/trigger-updates.yaml

@@ -1,7 +1,7 @@
 name: Trigger document updates
 
 on:
-  push:
+  pull_request:
     branches:
       - main
 
@@ -22,22 +22,50 @@ jobs:
       - name: Update milestones submodule
         run: git submodule update --remote --force milestones
 
+      - name: Check diff
+        run: | #  set an environment variable
+           if git diff --exit-code; then
+              echo "CHANGED=false" >> ${GITHUB_ENV}
+              echo "No changes - no PR"
+           else
+              echo "CHANGED=true" >> ${GITHUB_ENV}
+              echo "Git changes - should make PR"
+           fi
+
       - name: Create commit
+        if: env.CHANGED == 'true'
         run: |
           git config user.name github-actions
           git config user.email github-actions@github.com
           git add milestones
           git commit -m "Update milestones submodule"
+          git push
 
       - name: Get date
         id: get-date
         run: echo "::set-output name=date::$(/bin/date -u "+%Y-%m-%d %H:%M:%S")"
         shell: bash
 
       - name: Create Pull Request
-        uses: peter-evans/create-pull-request@v3
+        id: cpr
+        if: env.CHANGED == 'true'
+        uses: peter-evans/create-pull-request@v4
         with:
-          token: ${{ secrets.ROBO_JDS_PAT }}
+          token: ${{ secrets.WOM_MILESTONES_PAT }}
+          #IF i leave someone needs to make a new PAT
           branch: update-milestones
           branch-suffix: short-commit-hash
           title: Automatic milestone submodule update, ${{ steps.get-date.outputs.date }}
+          commit-message: Auto Milestones submodule update
+          body: Update milestones submodule so doc is regenerated.
+
+
+      - name: Enable Pull Request Automerge
+        if: steps.cpr.outputs.pull-request-operation == 'created'
+        uses: peter-evans/enable-pull-request-automerge@v1
+        # requires branch protection
+        with:
+          token: ${{ secrets.WOM_MILESTONES_PAT }}
+          repository: ${{ matrix.repo }}
+          pull-request-number: ${{ steps.cpr.outputs.pull-request-number }}
+          merge-method: merge