ci(GitHub): auto-commit changes from jobs

* Added stefanzweifel/git-auto-commit-action@v6.0.1 to each job.
* Further added comment steps explaining the auto-commit.

Author: userzimmermann

.github/workflows/linting.yml

@@ -20,11 +20,35 @@ jobs:
         go-version: 1.25.1
 
     - name: Run go mod tidy
-      run: go mod tidy
+      run: |
+          go mod tidy
 
     - name: Install & run golangci-lint
       uses: golangci/golangci-lint-action@4afd733a84b1f43292c63897423277bb7f4313a9 # v8
       with:
         version: latest
         install-mode: "goinstall"
         args: --fix
+
+    - name: Auto-commit lint fixes
+      id: auto_commit
+      if: github.event_name == 'pull_request'
+      uses: stefanzweifel/git-auto-commit-action@778341af668090896ca464160c2def5d1d1a3eb0 # v6.0.1
+      with:
+        commit_message: 'Auto-fix from ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}'
+
+    - name: Comment on PR about auto-commit
+      if: steps.auto_commit.outputs.changes_detected == 'true' && github.event_name == 'pull_request'
+      uses: actions/github-script@v8
+      with:
+        script: |
+            const runUrl = `${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}`
+            const commitSha = '${{ steps.auto_commit.outputs.commit_hash }}'
+            const commitUrl = `${{ github.server_url }}/${{ github.repository }}/commit/${commitSha}`
+
+            await github.rest.issues.createComment({
+                issue_number: context.issue.number,
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                body: `🤖 **Auto-fix applied**\n\nLinting fixes have been automatically committed: [${commitSha.substring(0, 7)}](${commitUrl})\n\n_From workflow run: [${runUrl}](${runUrl})_`
+            })