Use the official Rust nightly image for the main tests

3 jobs for master in 3 minutes and 21 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
failed #260988
nightly:test

00:03:21

 
  Lint
skipped #260989
rustfmt
 
  Pages
skipped #260990
pages
 
Name Stage Failure
failed
nightly:test Test

error: Could not compile `gobject-gen`.
warning: build failed, waiting for other jobs to finish...
error: aborting due to 2 previous errors

error: Could not compile `gobject-gen`.
warning: build failed, waiting for other jobs to finish...
error: build failed
ERROR: Job failed: exit code 1