ci: Allow disabling the whole of austriancoder's farm

Add a global-level variable that allows disabling all jobs that would
have gone to my lab, to be used in case of outages.

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Reviewed-by: David Heidelberg <david.heidelberg@collabora.com>
Reviewed-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18997>

.gitlab-ci.yml

@@ -24,6 +24,7 @@ variables:
   IGALIA_FARM: "online"
   ANHOLT_FARM: "online"
   VALVE_FARM: "online"
+  AUSTRIANCODER_FARM: "online"  # only etnaviv GPUs
 
 default:
   before_script:

.gitlab-ci/test-source-dep.yml

@@ -168,6 +168,10 @@
     # so only enable automatic testing when running in the context of Mesa to
     # prevent failures in forks.
     - if: '$CI_PROJECT_NAMESPACE != "mesa"'
+
+.austriancoder-farm-rules:
+  rules:
+    - if: '$AUSTRIANCODER_FARM == "offline"'
       when: never
 
 # Skips freedreno jobs if either of the farms we use are offline.
@@ -626,6 +630,7 @@
 .etnaviv-rules:
   stage: etnaviv
   rules:
+    - !reference [.austriancoder-farm-rules, rules]
     - !reference [.gl-rules, rules]
     - changes:
       - src/etnaviv/**/*