Clean /tmp after build

[eljeko]

It seems that

s2i/karaf/templates/s2i/assemble

doesn't clean the /tmp dir.

There is an option to delete the m2 (MAVEN_CLEAR_REPO=) but the /tmp dir contains also a ~/src with many files including the maven target dir with the .zip.

This makes the image to be ~two times bigger.

[vorburger]

@eljeko would this not break incremental builds? Or am I getting this wrong and sources are always freshly injected anyway? Or, if we did this, would we have to also save /tmp/src in s2i/save-artifacts?

If we do, then by default or as a new option? To be safe, perhaps best with a new option by env var, say S2I_CLEAR_SRC ?

BTW: Issue #12 is related to this - rather would not be needed, if we did this.