escape username when building LDAP query

3 jobs for master in 2 seconds
latest
Status Job ID Name Coverage
  Test
failed #478
test

00:00:02

failed #476
test

00:00:10

 
  Build
skipped #477
build
 
Name Stage Failure
failed
test Test
Cloning into '/home/uccportal/builds/zhzwQoKk/0/grahame/discord-bot'...
Checking out 21f3bd95 as master...
Skipping Git submodules setup
Checking cache for default...
time="2020-05-01T15:51:19+08:00" level=error msg="Docker executor: prebuilt image helpers will be loaded from /var/lib/gitlab-runner."
Successfully extracted cache
$ rustc --version
bash: line 80: rustc: command not found
ERROR: Job failed: exit status 1