Fixing syntax of CI script

1 job for master in 2 minutes and 48 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
failed #919
build:lektor

00:02:48

 
Name Stage Failure
failed
build:lektor Build
From https://git.mittelab.org/proj/www
+ f4dac56...22db3fb master -> origin/master (forced update)
* [new tag] first_approximation -> first_approximation
Checking out 22db3fb8 as master...
Filtering content: 100% (2/2), 1.71 MiB | 1.41 MiB/s Filtering content: 100% (2/2), 1.71 MiB | 825.00 KiB/s, done.
Skipping Git submodules setup
/bin/sh: /bin/sh: cannot execute binary file
/bin/sh: /bin/sh: cannot execute binary file
ERROR: Job failed: exit code 126