Merge branch 'gitlab-ci-expire-artifacts' into 'master'

Expire untracked artifacts after 1 hour

See merge request !643

.gitlab-ci.yml

@@ -22,6 +22,7 @@ stages:
     - ./configure --disable-fastparser
   artifacts:
     untracked: true
+    expire_in: '1 hour'
 
 .build: &build_job
   stage: build
@@ -29,6 +30,7 @@ stages:
     - make -k all
   artifacts:
     untracked: true
+    expire_in: '1 hour'
 
 .test: &test_job
   stage: test