d/salsa-ci.yml: set RELEASE to buster-backports

8 jobs for debian/buster-backports in 6 minutes and 26 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Build
passed #411890
build

00:02:51

 
  Test
passed #411895
autopkgtest

00:03:03

passed #411896
blhc

00:01:20

passed #411894
allowed to fail
lintian

00:01:44

passed #411897
piuparts

00:03:33

passed #411893
reprotest

00:02:26

passed #411892
test-build-all

00:02:16

passed #411891
test-build-any

00:02:42