Install pre-commit as a prereq for dag doc generation

.github/workflows/ci_cd.yml

@@ -105,6 +105,26 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Get Python version
+        id: python-version
+        run: echo "value=$(just py-version)" >> "$GITHUB_OUTPUT"
+
+      - name: Setup Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: "${{ steps.python-version.outputs.value }}"
+
+      - name: Cache pre-commit envs
+        uses: actions/cache@v3
+        with:
+          path: ~/.cache/pre-commit
+          key: ${{ runner.os }}-pre-commit-${{ hashFiles('.pre-commit-config.yaml') }}
+
+      - name: Install pre-commit
+        # This is required for the DAG doc check step only. If that step gets split out,
+        # this and the above steps setting up python are not needed for tests.
+        run: pip install pre-commit
+
       - name: Change permissions for Docker steps
         run: chmod -R 777 openverse_catalog/ tests/