app: in GimpDashboard, fix progressive-performance-log env-var

(cherry picked from commit d11cbbbb)
3 jobs for gimp-2-10 in 37 minutes and 36 seconds
Status Job ID Name Coverage
  Dependencies
passed #832215
deps-debian/testing

00:05:55

 
  Gimp
passed #832216
gimp-debian/testing-autotools

00:31:41

failed #832217
allowed to fail
gimp-debian/testing-autotools-distcheck

00:14:52

 
Name Stage Failure
failed
gimp-debian/testing-autotools-distcheck Gimp
make[1]: *** [Makefile:947: distdir] Error 2
make[1]: Leaving directory '/builds/GNOME/gimp/_build'
make: *** [Makefile:1054: dist] Error 2
Running after_script
Uploading artifacts for failed job
Uploading artifacts...
_build: found 13975 matching files

Uploading artifacts to coordinator... ok
id=832217 responseStatus=201 Created token=PaEyNtsF
ERROR: Job failed: exit code 1