Add versioning + commit in the build stamp

[pditommaso]

The version should be stored into the VERSION text field in the project root. Semantic version is a good candidate

The commit id can be retrieved using this snippet

https://github.com/seqeralabs/nf-tower-cloud/blob/fd47eb6642983207630465ef3307d8699add8784/build.gradle#L12-L16

[jordeu]

This was already done 12abc0c