update docker compose

Author: davidsiaw

.github/workflows/test-unit.yml

@@ -6,6 +6,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
+      - name: install docker compose
+        run: sudo curl -SL https://github.com/docker/compose/releases/download/v2.27.0/docker-compose-linux-x86_64 -o /usr/local/bin/docker-compose
       - name: Build and run tests
         run: |
           docker-compose -f .circleci/compose-unit.yml up -d --wait