chore: Add .gitlab-ci.yml

2 jobs for master in 2 minutes and 40 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #48617
unit_tests

00:01:31

 
  Build
failed #48618
binaries

00:01:08

 
Name Stage Failure
failed
binaries Build
go: downloading github.com/prometheus/procfs v0.0.0-20190117184657-bf6a532e95b1
go: downloading github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973
go: downloading github.com/prometheus/common v0.1.0
go: downloading github.com/matttproud/golang_protobuf_extensions v1.0.1
++ echo '
$ go build -a -ldflags '\''-extldflags "-static"'\'' -o "$OUTPUT_NAME" ./irma'
$ go build -a -ldflags '-extldflags "-static"' -o "$OUTPUT_NAME" ./irma
++ go build -a -ldflags '-extldflags "-static"' -o atumd-master-linux-amd64 ./irma
go: no such directory ./irma
ERROR: Job failed: exit code 1