chore(NODE-4075): add docs generation workflow (mongodb#3189)

Author: baileympearson

.github/workflows/build_docs.yml

@@ -0,0 +1,38 @@
+name: Build and commit docs
+
+on:
+  push:
+    branches: [ main ]
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  build:
+
+    # prevent subsequent commits from triggering the job multiple times
+    concurrency:
+      group: ci-${{ github.ref }}
+      cancel-in-progress: true
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Setup NodeJS
+      uses: actions/setup-node@v3
+      with:
+        node-version: 16.x
+        cache: 'npm'
+    - name: Install Dependencies
+      run: |
+        npm ci
+        sudo apt-get install hugo
+    - name: Build Docs
+      run: npm run build:docs -- --yes
+    - name: Open Pull Request
+      uses: peter-evans/create-pull-request@v4
+      with:
+        title: 'docs: generate docs from latest main'
+        delete-branch: true