public Builder putEnv(java.lang.String key, java.lang.String value) {
        if (key == null) {
          throw new NullPointerException("map key");
        }
        if (value == null) {
          throw new NullPointerException("map value");
        }
        internalGetMutableEnv().getMutableMap().put(key, value);
        bitField0_ |= 0x00000008;
        return this;
      }
<pre>
Optional. Environment variables passed to the container's entrypoint.
</pre>

<code>map&lt;string, string&gt; env = 4 [(.google.api.field_behavior) = OPTIONAL];</code>
java-workstations/proto-google-cloud-workstations-v1/src/main/java/com/google/cloud/workstations/v1/WorkstationConfig.java