use Localstack action

Author: grem11n

.github/workflows/terratest.yml

@@ -66,7 +66,9 @@ jobs:
           sudo mv /tmp/terraform /usr/local/bin/
 
       - name: Start Localstack
-        run: docker-compose up -d
+        uses: LocalStack/[email protected]
+        with:
+          image-tag: "latest"
 
       - name: Terratest
         env: