chore(ci): comment on pull requests about semver checks

.github/workflows/ci.yml

@@ -10,6 +10,9 @@ on:
   schedule:
     - cron: "0 0 * * 0"
 
+permissions:
+  pull-requests: write
+
 jobs:
   check:
     name: Check
@@ -46,9 +49,29 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Check semver
+        id: check_semver
         uses: obi1kenobi/cargo-semver-checks-action@v2
         with:
           package: git-cliff-core
+      - name: Comment on PR
+        if: always() && (steps.check_semver.outputs.error_message != null) && (github.event_name == 'pull_request')
+        uses: marocchino/sticky-pull-request-comment@v2
+        with:
+          header: pr-semver-check-error
+          message: |
+            Thank you for opening this pull request! ⛰️
+
+            There seems to be semver incompatibility issues reported by [cargo-semver-checks](https://github.com/obi1kenobi/cargo-semver-checks).
+
+            Details:
+
+            > ${{ steps.check_semver.outputs.error_message }}
+      - name: Update comment on PR
+        uses: marocchino/sticky-pull-request-comment@v2
+        if: (steps.check_semver.outputs.error_message == null) && (github.event_name == 'pull_request')
+        with:
+          header: pr-semver-check-error
+          delete: true
 
   test:
     name: Test suite