Extend expression language in arquillian configuration

[bartoszmajsak]

Add ability to refer to a file being available in the project, but expended to the full path during test execution, so we can refer to it in a flexible way.

Current situation

We either provide a full path:

<container qualifier="daemon" default="true">
    <configuration>
      <property name="javaVmArguments">
        -Djavax.net.ssl.trustStore=/home/ike/project/module-a/src/test/resources/store.jks
      </property>
    </configuration>
  </container>

or use environment variables to make it configurable for different enviroments (local, ci, other devs)

<container qualifier="daemon" default="true">
    <configuration>
      <property name="javaVmArguments">
        -Djavax.net.ssl.trustStore=${env.LAUNCHER_TESTS_TRUSTSTORE_PATH}
      </property>
    </configuration>
  </container>

Desired solution

Have a way to refer to either relative location or involving classpath resolution: -Djavax.net.ssl.trustStore=${classpath("file")} to resolve to an absolute path.

Not sure if easily doable, but let's spike it for 2-3d.