software/gitlab: run git-backup test during software step

To fail early when there is something wrong in the environment. We are
seeing git crashes and incompatibilities with git versions

software/gitlab/software.cfg

@@ -238,7 +238,7 @@ environment =
 
 [gowork.goinstall]
 git2go = ${go_github.com_libgit2_git2go_prepare:path}/vendor/libgit2/install
-command = bash -c ". ${gowork:env.sh} && CGO_CFLAGS=-I${:git2go}/include CGO_LDFLAGS='-L${:git2go}/lib -lgit2' go install ${gowork:buildflags} -v $(echo -n '${gowork:install}' |tr '\n' ' ')"
+command = bash -c ". ${gowork:env.sh} && CGO_CFLAGS=-I${:git2go}/include CGO_LDFLAGS='-L${:git2go}/lib -lgit2' go install ${gowork:buildflags} -v $(echo -n '${gowork:install}' |tr '\n' ' ') && go test -v lab.nexedi.com/kirr/git-backup"
 
 [gowork]
 golang  = ${golang1.13:location}
@@ -263,6 +263,7 @@ make-targets =
 
 [gitlab-backup]
 recipe = plone.recipe.command
+stop-on-error = true
 command =
   cp -a ${go_lab.nexedi.com_kirr_git-backup:location}/contrib/gitlab-backup ${gowork:bin}
 update-command = ${:command}