bug 1907211: add a single translations GPU worker in europe as a trial r?#releng-reviewers (#15)

Let's see how these perform, and the actual costs we pay for them vs. North America ones.

Author: bhearsum

environments.yml

@@ -126,6 +126,7 @@ firefoxci:
         us-west1: [us-west1-a, us-west1-b]
         us-east1: [us-east1-c]
         northamerica-northeast1: [northamerica-northeast1-a, northamerica-northeast1-b, northamerica-northeast1-c]
+        europe-west4: [europe-west4-a, europe-west4-b, europe-west4-c]
     invalid-instances:
       - zones: [us-central1-c]
         families: [t2a]
@@ -262,6 +263,7 @@ staging:
         us-west1: [us-west1-a, us-west1-b]
         us-east1: [us-east1-c]
         northamerica-northeast1: [northamerica-northeast1-a, northamerica-northeast1-b, northamerica-northeast1-c]
+        europe-west4: [europe-west4-a, europe-west4-b, europe-west4-c]
   cron:
     gecko:
       hooks_owner: [email protected]

worker-pools.yml

@@ -1584,9 +1584,9 @@ pools:
             maxTaskRunTime: 2592000
             enableInteractive: true
       minCapacity: 0
-      maxCapacity: 96
+      maxCapacity: 97
       implementation: generic-worker/worker-runner-linux
-      regions: [us-central1, us-west1, us-east1]
+      regions: [us-central1, us-west1, us-east1, europe-west4]
       image: monopacker-translations-worker
       instance_types:
         - minCpuPlatform: Intel Skylake