ci_fairy: Include commit SHA in junit error

It is already included in the testsuite name, but that isn't shown
in gitlab's UI, with the result that the front-page error report
is often useless and the user has to check out the pipeline logs.

Signed-off-by: Florian Müllner <fmuellner@gnome.org>
14 jobs for master in 15 minutes and 1 second (queued for 3 seconds)
Child pipeline (parent)
Status Job ID Name Coverage
  Ubuntu Container Build
passed #7645249
ubuntu:18.04@container-build@x86_64

00:00:58

passed #7645236
aarch64
ubuntu:20.10@container-build@aarch64

00:01:00

passed #7645226
ubuntu:20.10@container-build@x86_64

00:01:10

passed #7645242
kvm
ubuntu:20.10@qemu-build@x86_64

00:13:37

passed #7645230
ubuntu@cache-container-build@x86_64

00:00:56

 
  Ubuntu Check
passed #7645270
check labels ubuntu@x86_64:20.10

00:00:11

passed #7645267
do not rebuild ubuntu:20.10@container-build@x86_64

00:00:17

passed #7645273
pull upstream ubuntu:20.10@container-build@x86_64

00:00:23

passed #7645275
ubuntu:18.04@check@x86_64

00:00:15

passed #7645256
ubuntu:20.10@base-image@x86_64

00:00:47

passed #7645261
aarch64
ubuntu:20.10@check@aarch64

00:00:19

passed #7645253
ubuntu:20.10@check@x86_64

00:00:12

passed #7645264
kvm
ubuntu:20.10@qemu-check@x86_64

00:01:23

passed #7645259
ubuntu@cache-check@x86_64

00:00:14