reva_version="(Unknown)" on latest revad builds

[SamuAlfageme]

For some reason, the git output that used to fill these variables:

reva/Makefile

Lines 5 to 8 in 4a9be34

	GIT_COMMIT=`git rev-parse --short HEAD`
	GIT_BRANCH=`git rev-parse --symbolic-full-name --abbrev-ref HEAD`
	GIT_DIRTY=`git diff-index --quiet HEAD -- || echo "dirty-"`
	VERSION=`git describe --always`

... is empty:

[salfagem@lxplus765 ~]$ kubectl exec -ti iop-gateway-6fbcd98bb-cgv5k -- /go/bin/revad -version
version= commit= go_version=go1.13.15 build_date=2021-01-15T14:10:42+0000

... which contrast with the version string returned by the reva client (generated on the daily release pipeline):

reva version
version=2021_01_15T150629_47119beffae215190124e98e063f1734b9e75938 commit=47119beffae215190124e98e063f1734b9e75938 go_version=go1.13.15 build_date=2021-01-15

---

This issue makes the reva_version exposed via revad_sys_info metric to be "(Unknown)"

# HELP revad_sys_info A metric with a constant '1' value labeled by various system information elements
# TYPE revad_sys_info gauge
revad_sys_info{reva_build_date="2021-01-15T14:10:42+0000",reva_version="(Unknown)"} 1

[SamuAlfageme]

Therefore, some of these values are missing on the site information dashboard:

cc/ @Daniel-WWU-IT

[Daniel-WWU-IT]

Nothing I can do about this. I use the information that is somehow built into Reva during CI, but if that is empty, I output this "(Unknown)" instead. I guess during all these recent changes to the CI, something must have broken...