Merge branch '1160-systemd-fix' into 'develop'

Resolve "funkwhale-worker.service error option --concurrency"

Closes #1160 (closed)

See merge request !1296 (merged)

(cherry picked from commit 31413fe6)

d3fdce07 Correctly set default value in systemd unit 942d0d14 Add changelog fragment

changes/changelog.d/1160.bugfix

+Fixed systemd unit for funkwhale-worker (#1160)