public CouchbaseContainer withCredentials(final String username, final String password) {
        checkNotRunning();
        this.username = username;
        this.password = password;
        return this;
    }
Set custom username and password for the admin user.

@param username the admin username to use.
@param password the password for the admin user.
@return this {@link CouchbaseContainer} for chaining purposes.
modules/couchbase/src/main/java/org/testcontainers/couchbase/CouchbaseContainer.java