Create workflow to post comment when a PR is opened without maintainer edit access

.github/workflows/notify-when-maintainers-cannot-edit.yaml

@@ -0,0 +1,61 @@
+name: Notify When Maintainers Cannot Edit
+
+# **What it does**: Notifies the author of a PR when their PR does not allow maintainers to edit it.
+# **Why we have it**: To prevent having to do this manually.
+# **Who does it impact**: Open-source.
+
+on:
+  pull_request:
+    types:
+      - opened
+
+jobs:
+  notify-when-maintainers-cannot-edit:
+    if: github.repository == 'github/docs'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/github-script@2b34a689ec86a68d8ab9478298f91d5401337b7d
+        with:
+          script: |
+            const query = `
+              query($number: Int!) {
+                repository(owner: "github", name: "docs") {
+                  pullRequest(number: $number) {
+                    headRepositoryOwner {
+                      login
+                    }
+                    maintainerCanModify
+                  }
+                }
+              }
+            `;
+
+            const pullNumber = context.issues.number;
+            const variables = { number: pullNumber };
+
+            try {
+              console.log(`Check github/docs#${pullNumber} for maintainer edit access ...`);
+              const result = await github.graphql(query, variables);
+
+              console.log(JSON.stringify(result, null, 2));
+
+              const pullRequest = result.data.repository.pullRequest;
+
+              if (pullRequest.headRepositoryOwner.login == 'github') {
+                console.log('PR owned by github');
+                return;
+              }
+
+              if (!pullRequest.maintainerCanModify) {
+                console.log('PR not owned by github and does not have maintainer edits enabled');
+
+                await github.issues.createComment({
+                  issue_number: pullNumber,
+                  owner: 'github',
+                  repo: 'docs',
+                  body: "Thanks for submitting a PR to the GitHub Docs project!\n\nIn order to review and merge PRs most efficiently, we require that all PRs grant maintainer edit access before we review them. For more information about this, [check the contribution guide](https://github.com/github/docs/blob/main/CONTRIBUTING.md)."
+                });
+              }
+            } catch(e) {
+              console.log(error);
+            }