feat: add a feedback comment on a validation error

.github/actions/validate-format/action.yml

@@ -0,0 +1,6 @@
+name: 'Validate Format'
+runs:
+  using: 'composite'
+  steps:
+    - run: /bin/bash "${{ github.action_path }}/validate_format.sh" "${{ github.workspace }}/program-list.json"
+      shell: bash

.github/actions/validate-format/validate_format.sh

@@ -0,0 +1,8 @@
+PROGRAM_LIST_JSON="$1"
+
+jq --indent 3 -s '.[] | unique_by(.program_name)' < "$PROGRAM_LIST_JSON" > "_"
+
+if ! cmp -s "$PROGRAM_LIST_JSON" "_"; then
+  echo '::error title=Bad format::The "program-list.json" file is not formatted and sorted in accordance with the guidelines. Please use the command from https://github.com/disclose/diodb#how-to-contribute to format and sort the file.'
+  exit 1
+fi

.github/workflows/feedback.yml

@@ -0,0 +1,24 @@
+name: feedback
+
+on:
+  workflow_run:
+    workflows: [validate-program-list]
+    types: [completed]
+
+permissions:
+  pull-requests: write
+
+jobs:
+  feedback:
+    runs-on: ubuntu-latest
+    if: github.event.workflow_run.event == 'pull_request' && github.event.workflow_run.conclusion == 'failure' 
+    steps:
+      - uses: peter-evans/create-or-update-comment@c9fcb64660bc90ec1cc535646af190c992007c32 # v2.0.0
+        with:
+          issue-number: ${{ github.event.workflow_run.pull_requests[0].number }}
+          body: |
+            Some of the automated checkes have failed. Passing the checks is required to merge the pull request.
+
+            Please see annotations at https://github.com/${{ github.repository }}/actions/runs/${{ github.event.workflow_run.id }} for the details and steps to remediate the issue(s).
+
+            cc @${{ github.event.workflow_run.actor.login }}

.github/workflows/validate-program-list.yml

@@ -50,10 +50,4 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - name: Verify formatting
-        run: |
-          jq --indent 3 -s '.[] | unique_by(.program_name)' < program-list.json > _
-          if ! diff program-list.json _; then
-            echo 'Please format `program-list.json` with https://github.com/disclose/diodb#how-to-contribute.'
-            exit 1
-          fi
+      - uses: ./.github/actions/validate-format