.github: e2e: Use proper YAML syntax for up check

Author: ix5

.github/workflows/e2e-tests.yml

@@ -47,7 +47,8 @@ jobs:
         run: make docker-js-unit
 
       - name: Check if containers are up, sleep if not
-        run: [ "$(docker inspect --format='{{.State.Health.Status}}' isso-server)" = 'healthy' ] || sleep 5
+        shell: bash
+        run: '[ "$(docker inspect --format={{.State.Health.Status}} isso-server)" = "healthy" ] || sleep 5'
 
       - name: Client integration tests
         run: make docker-js-integration