ci: use git diff to add M-database-changes label for pr that contai…

…ns migrations and schema changes (#4625)

Co-authored-by: hyperswitch-bot[bot] <148525504+hyperswitch-bot[bot]@users.noreply.github.com>

.github/workflows/pr-convention-checks.yml

@@ -128,3 +128,60 @@ jobs:
               exit 1
             fi
           done <<< "${linked_issues}"
+
+  pr_labeler:
+    name: Attach suitable labels to PR
+    if: ${{ github.event_name == 'pull_request_target' }}
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Generate GitHub app token
+        id: generate_app_token
+        uses: actions/create-github-app-token@v1
+        with:
+          app-id: ${{ secrets.HYPERSWITCH_BOT_APP_ID }}
+          private-key: ${{ secrets.HYPERSWITCH_BOT_APP_PRIVATE_KEY }}
+          owner: ${{ github.event.repository.owner.login }}
+
+      - name: Get files changed
+        env:
+          GH_TOKEN: ${{ steps.generate_app_token.outputs.token }}
+        shell: bash
+        run: |
+          migration_and_schema_changes=false
+          openapi_changes=false
+
+          files_changed="$(gh api --header "Accept: application/vnd.github+json" --header "X-GitHub-Api-Version: 2022-11-28" --paginate https://api.github.com/repos/juspay/hyperswitch/pulls/${{ github.event.pull_request.number }}/files --jq '.[] | .filename')"
+
+          if echo "${files_changed}" | grep --quiet --extended-regexp '(^migrations/.*/(up|down)\.sql$|^crates/diesel_models/src/schema.rs$)' ; then
+            migration_and_schema_changes='true'
+          fi
+
+          if echo "${files_changed}" | grep --quiet --extended-regexp '^(api-reference/openapi_spec.json)$'; then
+            openapi_changes='true'
+          fi
+
+          echo "migration_and_schema_changes=${migration_and_schema_changes}" >> "${GITHUB_ENV}"
+          echo "openapi_changes=${openapi_changes}" >> "${GITHUB_ENV}"
+
+      - name: Add/Remove 'M-database-changes' based on Migration or Schema changes
+        shell: bash
+        env:
+          GH_TOKEN: ${{ steps.generate_app_token.outputs.token }}
+        run: |
+          if ${{ env.migration_and_schema_changes == 'true' }}; then
+            gh --repo ${{ github.event.repository.full_name }} pr edit --add-label 'M-database-changes' ${{ github.event.pull_request.number }}
+          else
+            gh --repo ${{ github.event.repository.full_name }} pr edit --remove-label 'M-database-changes' ${{ github.event.pull_request.number }}
+          fi
+
+      - name: Add/Remove 'M-api-contract-changes' based on OpenAPI Spec changes
+        shell: bash
+        env:
+          GH_TOKEN: ${{ steps.generate_app_token.outputs.token }}
+        run: |
+          if ${{ env.openapi_changes == 'true' }}; then
+            gh --repo ${{ github.event.repository.full_name }} pr edit --add-label 'M-api-contract-changes' ${{ github.event.pull_request.number }}
+          else
+            gh --repo ${{ github.event.repository.full_name }} pr edit --remove-label 'M-api-contract-changes' ${{ github.event.pull_request.number }}
+          fi