Incorrect workdir in 3.3.0 Alpine image

[theoutsider24]

Dockerfile.sonarscanner-3.3.0-alpine still has "WORKDIR /root", should've been changed to "WORKDIR /src" as part of pull request #27

[newtmitch]

Thanks, good catch. I've updated the Dockerfile and am testing now. In fact, you bring up another good point, which is the WORKDIR variable should actually be /usr/src to match with the projectBaseDir setting in the CMD at the end. Thanks for picking that up.