Revert to using usable workflow

.github/workflows/main.yml

@@ -7,28 +7,7 @@ on:
 
 jobs:
   main:
-    runs-on: ubuntu-22.04
-    env:
-      LANG: C.UTF-8
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-      - name: Setup python-version
-        uses: actions/setup-python@v5
-        with:
-          python-version: "3.12"
-          architecture: "x64"
-      - name: Install Python dependencies
-        run: |
-          pip install pipenv
-          pipenv install --dev --system
-      - name: Generate requirements
-        run: pip freeze > requirements.txt
-      - name: Run Snyk to check for vulnerabilities in Python
-        uses: snyk/actions/python@master
-        env:
-          SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
-        with:
-          command: monitor --file=requirements.txt --package-manager=pip --skip-unresolved
+    uses: ocadotechnology/codeforlife-workspace/.github/workflows/backend.yaml@snyk
+    secrets: inherit
+    with:
+      source-path: src