feat(ci): create PR suggestion by comment

.github/workflows/pr-format-suggestion.yml

@@ -0,0 +1,82 @@
+name: PR Format
+
+on:
+  issue_comment:
+    types: [created]
+
+jobs:
+  tests:
+    if: |
+      github.event.issue.pull_request && # only run on PRs
+      !github.event.issue.pull_request.merged_at && # ignore merged PRs
+      startsWith(github.event.comment.body, '@mdn-bot /format') # only run when asked
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check push permission
+        run: |
+          # Check if the sender of the comment is collaborator or the author of the PR
+          gh api repos/{owner}/{repo}/collaborators/${{ github.event.sender.login }}
+          # check if the exit code is 0
+          if [ $? -ne 0 ]; then
+            # if not, check if the sender of the comment is the author of the PR
+            PR_AUTHER=$(gh api repos/${{ github.repository }}/pulls/${{ github.event.issue.number }} \
+              --jq '.user.login')
+            if [ "${PR_AUTHER}" != "${{ github.event.sender.login }}" ]; then
+              # if not, send a comment and exit
+              gh pr comment ${{ github.event.issue.number }} \
+                --body "Sorry, only collaborators or the author of the PR can run this command."
+                --repo ${{ github.repository }}
+              exit 1
+            fi
+          fi
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Get PR information
+        run: |
+          # Get the base and head SHA
+          SHA=$(gh api repos/${{ github.repository }}/pulls/${{ github.event.issue.number }} \
+            --jq '.base.sha, .head.sha')
+          # Set the environment variables
+          echo "BASE_SHA=$(echo $SHA | cut -d ' ' -f 1)" >> $GITHUB_ENV
+          echo "HEAD_SHA=$(echo $SHA | cut -d ' ' -f 2)" >> $GITHUB_ENV
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - uses: actions/checkout@v3
+        with:
+          ref: ${{ env.BASE_SHA }}
+
+      - name: Setup Node.js environment
+        uses: actions/setup-node@v3
+        with:
+          node-version-file: ".nvmrc"
+          cache: "yarn"
+          cache-dependency-path: yarn.lock
+
+      - name: Install all yarn packages
+        run: |
+          yarn --frozen-lockfile
+
+      - name: Get changed files
+        run: |
+          # Use the GitHub API to get the list of changed files
+          # documenation: https://docs.github.com/rest/commits/commits#compare-two-commits
+          DIFF_DOCUMENTS=$(gh api repos/{owner}/{repo}/compare/${{ env.BASE_SHA }}...${{ env.HEAD_SHA }} \
+            --jq '.files | .[] | select(.status|IN("added", "modified", "renamed", "copied", "changed")) | .filename')
+
+          # filter out files that are not interesting to us
+          GIT_DIFF_CONTENT=$(echo "${DIFF_DOCUMENTS}" | egrep -i ".*\.(md|yml)$" | xargs)
+          echo "GIT_DIFF_CONTENT=${GIT_DIFF_CONTENT}" >> $GITHUB_ENV
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Format changed content
+        if: ${{ env.GIT_DIFF_CONTENT }}
+        run: |
+          yarn prettier --write ${{ env.GIT_DIFF_CONTENT }}
+
+      - name: Submit suggestion
+        uses: reviewdog/action-suggester@v1
+        with:
+          tool_name: prettier