Pre-resolve LazyDockerClient from GenericContainer#start() (#3530)

Author: bsideup

core/src/main/java/org/testcontainers/containers/GenericContainer.java

@@ -305,6 +305,8 @@ public void start() {
             return;
         }
         Startables.deepStart(dependencies).get();
+        // trigger LazyDockerClient's resolve so that we fail fast here and not in getDockerImageName()
+        dockerClient.authConfig();
         doStart();
     }