ci: install awslocal for emulator tests

Author: Mike McDougall

.github/workflows/ci.yml

@@ -100,6 +100,12 @@ jobs:
           cache: 'pip'
           cache-dependency-path: tests/python/requirements.txt
 
+      - name: Install Localstack CLI (awslocal)
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install --user awscli-local
+          echo "$HOME/.local/bin" >> "$GITHUB_PATH"
+
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with: