[release-12.3.1] CI: Make notify-pr workflow optional (#113899)

CI: Make notify-pr workflow optional (#113896)

* CI: Make notify-pr workflow optional

* also set repo to the current repo

* fix find-pr

(cherry picked from commit d92cb9f7a6)

Co-authored-by: Kevin Minehart <5140827+kminehart@users.noreply.github.com>

.github/workflows/release-build.yml

@@ -320,12 +320,16 @@ jobs:
           repositories: '["grafana"]'
           permissions: '{"issues": "write", "pull_requests": "write", "contents": "read"}'
       - name: Find PR
+        continue-on-error: true
+        id: find-pr
         env:
           GITHUB_TOKEN: ${{ steps.generate_token.outputs.token }}
           GRAFANA_COMMIT: ${{ needs.setup.outputs.grafana-commit }}
-        run: echo "ISSUE_NUMBER=$(gh api "/repos/grafana/grafana/commits/${GRAFANA_COMMIT}/pulls" | jq -r '.[0].number')" >> "$GITHUB_ENV"
+          REPO: ${{ github.repository }}
+        run: echo "ISSUE_NUMBER=$(gh api "/repos/grafana/${REPO}/commits/${GRAFANA_COMMIT}/pulls" | jq -r '.[0].number')" >> "$GITHUB_ENV"
       - name: Find Comment
         uses: peter-evans/find-comment@3eae4d37986fb5a8592848f6a574fdf654e61f9e # v3
+        if: ${{ steps.find-pr.outcome == 'success' }}
         id: fc
         with:
           issue-number: ${{ env.ISSUE_NUMBER }}
@@ -334,6 +338,7 @@ jobs:
           token: ${{ steps.generate_token.outputs.token }}
       - name: Create or update comment
         uses: peter-evans/create-or-update-comment@e8674b075228eee787fea43ef493e45ece1004c9 # v4
+        if: ${{ steps.find-pr.outcome == 'success' }}
         with:
           token: ${{ steps.generate_token.outputs.token }}
           comment-id: ${{ steps.fc.outputs.comment-id }}