Revert "[alt-builder] Revert to stable gcc"

This reverts commit f8d537d7
2 jobs from master in 6 minutes and 20 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Deploy
passed #158572
deploy:alt-builder

00:06:20

failed #158573
deploy:repository/aptly

00:00:28

 
Name Stage Failure
failed
deploy:repository/aptly Deploy
$ docker build -t "$IMAGE_NAME" .
Sending build context to Docker daemon 3.584kB
Step 1/3 : FROM amd64/debian:buster
buster: Pulling from amd64/debian
90fe46dd8199: Pulling fs layer
90fe46dd8199: Verifying Checksum
90fe46dd8199: Download complete
failed to register layer: Error processing tar file(exit status 1): write /usr/share/locale/nb/LC_MESSAGES/coreutils.mo: no space left on device
ERROR: Job failed: exit code 1