ci: Allow disabling the whole of the Igalia farm

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

Reviewed-by: Eric Engestrom <eric@igalia.com>
Reviewed-by: Andres Gomez <agomez@igalia.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Signed-off-by: David Heidelberg <david.heidelberg@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17178>

.gitlab-ci.yml

@@ -21,6 +21,7 @@ variables:
   COLLABORA_FARM: "offline"
   MICROSOFT_FARM: "online"
   LIMA_FARM: "online"
+  IGALIA_FARM: "online"
 
 default:
   before_script:

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

@@ -139,6 +139,11 @@
     - if: '$COLLABORA_FARM == "offline" && $RUNNER_TAG =~ /^mesa-ci-x86-64-lava-/'
       when: never
 
+.igalia-farm-rules:
+  rules:
+    - if: '$IGALIA_FARM == "offline"'
+      when: never
+
 # Skips freedreno jobs if either of the farms we use are offline.
 .freedreno-farm-rules:
   rules:
@@ -279,6 +284,7 @@
 .vc4-rules:
   stage: broadcom
   rules:
+    - !reference [.igalia-farm-rules, rules]
     - !reference [.gl-rules, rules]
     - changes:
       - src/broadcom/**/*
@@ -290,6 +296,7 @@
 .v3d-rules:
   stage: broadcom
   rules:
+    - !reference [.igalia-farm-rules, rules]
     - !reference [.gl-rules, rules]
     - changes:
       - src/broadcom/**/*
@@ -301,6 +308,7 @@
 .v3dv-rules:
   stage: broadcom
   rules:
+    - !reference [.igalia-farm-rules, rules]
     - !reference [.vulkan-rules, rules]
     - changes:
       - src/broadcom/**/*