Reset network creation state if network creation fails (#6668)

This allows any `startAttempts` that the user has applied to the container to retry the creation of the network too.

Fix #6667

Signed-off-by: kwall <[email protected]>

Author: k-wall

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

@@ -59,9 +59,16 @@ class NetworkImpl extends ExternalResource implements Network {
         @Override
         public synchronized String getId() {
             if (initialized.compareAndSet(false, true)) {
-                id = create();
+                boolean success = false;
+                try {
+                    id = create();
+                    success = true;
+                } finally {
+                    if (!success) {
+                        initialized.set(false);
+                    }
+                }
             }
-
             return id;
         }