fix(devservices): Fix healtcheck command for objectstore container (#188)

Follow-up to #185. The healtcheck command requires a shell to run, which
is not available in distroless containers. This changes to `CMD` mode,
which runs the binary directly

Author: jan-auer

devservices/config.yml

@@ -29,7 +29,7 @@ services:
       FSS_LOGGING__LEVEL: "debug"
     command: run
     healthcheck:
-      test: /bin/entrypoint healthcheck
+      test: ["CMD", "/bin/entrypoint", "healthcheck"]
       interval: 5s
       timeout: 1s
       retries: 5