@SuppressWarnings({"rawtypes"})
    @java.lang.Override
    protected com.google.protobuf.MapFieldReflectionAccessor internalGetMapFieldReflection(
        int number) {
      switch (number) {
        case 4:
          return internalGetEnv();
        default:
          throw new RuntimeException("Invalid map field number: " + number);
      }
    }
<pre>
A Docker container.
</pre>

Protobuf type {@code google.cloud.workstations.v1beta.WorkstationConfig.Container}
java-workstations/proto-google-cloud-workstations-v1beta/src/main/java/com/google/cloud/workstations/v1beta/WorkstationConfig.java