Add deb-src entry to temporarily fix salsa-ci-team/pipeline#68

8 jobs for master in 53 minutes and 49 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #262987
build

00:19:13

 
  Test
passed #262992
autopkgtest

00:18:44

passed #262993
blhc

00:01:48

passed #262991
lintian

00:02:01

passed #262994
piuparts

00:03:40

passed #262990
reprotest

00:34:34

passed #262989
test-build-all

00:19:21

passed #262988
test-build-any

00:02:51