Use source for sourcing instead of .

It improves readability according to some..
5 jobs for source-ftw in 30 minutes and 38 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Lint
passed shellcheck #11136

00:00:14

passed shfmt #11137

00:00:17

 
  Build
passed build #11138
fast-single-thread

00:21:20

 
  Test
passed test-cloudimg-qemu #11140

00:08:59

passed test-vagrant-boxes-format #11139

00:00:27