Fix ordering. Update to use PR merge ref (#1383)

.github/workflows/pr_comment_bot.yml

@@ -71,40 +71,10 @@ jobs:
           echo "Showing help on PR ${PR_NUMBER}"
           gh pr comment ${PR_NUMBER} --repo $REPO --body "Hello<br/><br/>You can use the following commands:<br/>    /test - run tests on a PR<br/>    /force-approve - force approval of the PR (i.e. skip the deployment checks)<br/>    /help - show this help"
 
-      # Check if the PR build/test needs to run
-      - name: Checkout
-        if: ${{ steps.check_command.outputs.result == 'run-tests' || steps.check_command.outputs.result == 'force-approve' }}
-        uses: actions/checkout@v2
-        with:
-          repository: ${{ inputs.prRepo }}
-          ref: ${{ inputs.prRef }}
-          persist-credentials: false
-
-      - uses: dorny/paths-filter@v2
-        id: filter
-        if: ${{ steps.check_command.outputs.result == 'run-tests' }}
-        with:
-          filters: |
-            not-md:
-              # we need to check for changes in files other than *.md
-              - '**/!(*.md)'
-
-      # If we don't run the actual deploy (below) we won't receive a check-run status,
-      # and will have to send it "manually"
-      - name: Bypass E2E check-runs status
-        if: ${{ (steps.check_command.outputs.result == 'run-tests' && steps.filter.outputs.not-md == 'false') || steps.check_command.outputs.result == 'force-approve' }}
-        uses: LouisBrunner/[email protected]
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          # the name must be identical to the one received by the real job
-          name: "Deploy PR / Run E2E Tests (Smoke)"
-          status: "completed"
-          conclusion: "success"
-
       # Get PR commit details for running tests
       - id: get_pr_details
         name: Get PR details
-        if: ${{ steps.check_command.outputs.result == 'run-tests' && steps.filter.outputs.not-md == 'true' }}
+        if: ${{ steps.check_command.outputs.result == 'run-tests' }}
         env:
           PR_NUMBER: ${{ github.event.issue.number }}
           REPO: ${{ github.event.repository.full_name }}
@@ -120,10 +90,13 @@ jobs:
           echo "Getting PR ref..."
           ref=$(gh pr view $PR_NUMBER --repo $REPO --json commits | jq -r ".[] | last | .oid")
           echo -e "\tLatest commit ref: $ref"
+          # Get the prMergeCommit as this is what the pull_request trigger would build
+          prMergeRef=$(gh pr view $PR_NUMBER --repo $REPO --json potentialMergeCommit | jq -r .potentialMergeCommit.oid)
+          echo -e "\tprMergeRef: $prMergeRef"
           echo
 
           echo "Setting outputs"
-          echo "::set-output name=prRef::${ref}"
+          echo "::set-output name=prRef::${prMergeRef}"
           echo "::set-output name=prRepo::${pr_owner}/${pr_repo}"
           echo "Done"
 
@@ -134,6 +107,39 @@ jobs:
           echo "using id of: ${REFID} for GitHub Ref: ${github_pr_ref}"
           echo "::set-output name=refid::${REFID}"
 
+
+      # Check if the PR build/test needs to run
+      - name: Checkout
+        if: ${{ steps.check_command.outputs.result == 'run-tests' || steps.check_command.outputs.result == 'force-approve' }}
+        uses: actions/checkout@v2
+        with:
+          # repository: ${{ steps.get_pr_details.outputs.prRepo }}
+          ref: ${{ steps.get_pr_details.outputs.prRef }}
+          persist-credentials: false
+
+      - uses: dorny/paths-filter@v2
+        id: filter
+        if: ${{ steps.check_command.outputs.result == 'run-tests' }}
+        with:
+          base: main
+          ref: ${{ steps.get_pr_details.outputs.prRef }}
+          filters: |
+            not-md:
+              # we need to check for changes in files other than *.md
+              - '**/!(*.md)'
+
+      # If we don't run the actual deploy (below) we won't receive a check-run status,
+      # and will have to send it "manually"
+      - name: Bypass E2E check-runs status
+        if: ${{ (steps.check_command.outputs.result == 'run-tests' && steps.filter.outputs.not-md == 'false') || steps.check_command.outputs.result == 'force-approve' }}
+        uses: LouisBrunner/[email protected]
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          # the name must be identical to the one received by the real job
+          name: "Deploy PR / Run E2E Tests (Smoke)"
+          status: "completed"
+          conclusion: "success"
+
   run_test:
     # Run the tests with the re-usable workflow
     needs: [pr_comment]
@@ -142,7 +148,7 @@ jobs:
     uses: ./.github/workflows/deploy_tre_reusable.yml
     with:
       prRef: ${{ needs.pr_comment.outputs.prRef }}
-      prRepo: ${{ needs.pr_comment.outputs.prRepo }}
+      # prRepo: ${{ needs.pr_comment.outputs.prRepo }}
       ciGitRef: ${{ needs.pr_comment.outputs.ciGitRef }}
     secrets:
       AAD_TENANT_ID: ${{ secrets.AAD_TENANT_ID }}