public Optional<Output<String>> value() {
        return Optional.ofNullable(this.value);
    }
@return Variable references $(VAR_NAME) are expanded using the previously defined environment variables in the container and any service environment variables. If a variable cannot be resolved, the reference in the input string will be unchanged. Double $$ are reduced to a single $, which allows for escaping the $(VAR_NAME) syntax: i.e. &#34;$$(VAR_NAME)&#34; will produce the string literal &#34;$(VAR_NAME)&#34;. Escaped references will never be expanded, regardless of whether the variable exists or not. Defaults to &#34;&#34;.
sdk/java/src/main/java/com/pulumi/kubernetes/core/v1/inputs/EnvVarPatchArgs.java