Add poetry to CI

.github/workflows/ci.yml

@@ -62,6 +62,8 @@ jobs:
           fetch-depth: 0
       - name: Install dependencies
         run: yarn install --frozen-lockfile
+      - name: Install Poetry # For our python services
+        uses: snok/install-poetry@v1
       # Set convenience variables. Source: https://nx.dev/ci/recipes/set-up/monorepo-ci-github-actions#get-the-commit-of-the-last-successful-build
       - name: Derive appropriate SHAs for base and head for `nx affected` commands
         uses: nrwl/nx-set-shas@v4