Add API documentation workflow

.github/workflows/update-api-docs.yml

@@ -0,0 +1,42 @@
+name: Generate API documentation
+
+on:
+  pull_request:
+    branches:
+      - develop
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+        with:
+          ref: ${{ github.head_ref }}
+
+      - name: Copy .env.example file to .env file
+        run: cp .env.example .env
+
+      - name: Set Git identity
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+
+      - name: Start Docker Compose
+        run: docker compose -f docker-compose.yml -f docker-compose.dev.yml up --detach dev-service
+
+      - name: Generate API documentation
+        run: docker exec -d mathesar_service_dev ./manage.py spectacular --color --file schema.yml
+
+      - name: Check if schema file has changed
+        id: check-schema-file
+        run: git diff --quiet schema.yml
+
+      - name: Commit schema file
+        if: steps.check-schema-file.outputs.status == 1
+        run: git add schema.yml && git commit -m "Updated schema file"
+
+      - name: Push changes to remote branch
+        if: steps.check-schema-file.outputs.status == 1
+        run: git push origin ${{ github.head_ref }}