workflows: split PR comment to separate workflow

.github/workflows/main.yml

@@ -1,5 +1,5 @@
 on: pull_request
-
+name: CI jobs
 jobs:
   main:
     permissions:
@@ -19,17 +19,12 @@ jobs:
         id: spell-check
         run: |
           status=0
-          echo "### :warning: Spell check failed" > typos-output
-          uv run typos --format brief >> typos-output || status=$?
-          if [[ ${status} -ne 0 ]]; then
-            echo "failed=true" >> "${GITHUB_OUTPUT}"
-            exit 0
-          fi
-          exit ${status}
+          echo "### :bulb: Spell check report" > spell_check_report.md
+          uv run typos --format brief >> spell_check_report.md || status=$?
+          exit 0
 
-      - name: Spell check comment
-        uses: thollander/actions-comment-pull-request@v3
+      - name: Save spell check report artifact
+        uses: actions/upload-artifact@v4
         with:
-          comment-tag: spell-check-failed-comment
-          file-path: typos-output
-          mode: ${{ steps.spell-check.outputs.failed == 'true' && 'upsert' || 'delete' }}
+          name: Spell check report
+          path: spell_check_report.md

.github/workflows/pr_comment.yml

@@ -0,0 +1,35 @@
+on:
+  workflow_run:
+    workflows:
+      - CI jobs
+    types:
+      - completed
+
+jobs:
+  spell-check-comment:
+    runs-on: ubuntu-latest
+    if: >
+      github.event.workflow_run.event == 'pull_request' &&
+      github.event.workflow_run.conclusion == 'success'
+    steps:
+      - name: Download spell check report
+        uses: actions/download-artifact@v4
+        with:
+          github-token: ${{ github.token }}
+          name: Spell check report
+          run-id: ${{ github.event.workflow_run.id }}
+      - name: Check if spell check failed
+        id: spell-check
+        run: |
+          lines=$(wc -l spell_check_report.md | cut -d ' ' -f1)
+          if [[ ${lines} -gt 1 ]]; then
+            echo "failed=true" >> "${GITHUB_OUTPUT}"
+          else
+            echo "failed=false" >> ${GITHUB_OUTPUT}"
+          fi
+      - name: Post spell check PR comment
+        uses: thollander/actions-comment-pull-request@v3
+        with:
+          comment-tag: spell-check-failed
+          file-path: spell_check_report.md
+          mode: ${{ steps.spell-check.outputs.failed == 'true' && 'upsert' || 'delete' }}