NullPointerException from exposeAsEnvironment for container with custom name

[tmccarthy]

If a container has a custom name specified with the container-name option, exposeAsEnvironment() throws an exception with the following stacktrace:

java.lang.NullPointerException: Cannot invoke method endsWith() on null object
        at java_lang_String$endsWith$1.call(Unknown Source)
        at com.avast.gradle.dockercompose.ComposeExtension$_exposeAsEnvironment_closure3$_closure9.doCall(ComposeExtension.groovy:68)
        at com.avast.gradle.dockercompose.ComposeExtension$_exposeAsEnvironment_closure3.doCall(ComposeExtension.groovy:67)
        at com.avast.gradle.dockercompose.ComposeExtension.exposeAsEnvironment(ComposeExtension.groovy:66)
        at com.avast.gradle.dockercompose.ComposeExtension$exposeAsEnvironment$3.call(Unknown Source)
        ...

The issue is that the regex at line 124 of ComposeUp will not necessarily match a custom container name. This leads to a null value of instanceName, which eventually causes the exception.

I will submit a pull request fixing this issue momentarily.

[augi]

Released as 0.4.3, thanks again!