add highmem22 runners, scale to zero and assign flink job to highmem22 (

apache#33162)

.github/gh-actions-self-hosted-runners/arc/config/arc_autoscaler.tpl

@@ -39,4 +39,7 @@ spec:
     scaleDownThreshold: '0.25'
     scaleUpFactor: '2'
     scaleDownFactor: '0.5'
+  - type: TotalNumberOfQueuedAndInProgressWorkflowRuns
+    repositoryNames:
+    - beam
   %{~ endif ~}

.github/gh-actions-self-hosted-runners/arc/environments/beam.env

@@ -81,5 +81,22 @@ additional_runner_pools = [{
     labels = ["self-hosted", "ubuntu-20.04", "highmem"]
     enable_selector = true
     enable_taint = true
+},
+{
+    name = "highmem-runner-22"
+    machine_type = "c3-highmem-22"
+    runner_image = "us-central1-docker.pkg.dev/apache-beam-testing/beam-github-actions/beam-arc-runner:3063b55757509dad1c14751c9f2aa5905826d9a0"
+    min_node_count = "0"
+    max_node_count = "2"
+    min_replicas = "0"
+    max_replicas = "2"
+    webhook_scaling = false
+    requests = {
+        cpu = "7.5"
+        memory = "100Gi"
+    }
+    labels = ["self-hosted", "ubuntu-20.04", "highmem22"]
+    enable_selector = true
+    enable_taint = true
 }]
 #state_bucket_name = "beam-arc-state"

.github/workflows/beam_PostCommit_Python_Examples_Flink.yml

@@ -55,7 +55,7 @@ jobs:
       github.event_name == 'workflow_dispatch' ||
       github.event_name == 'pull_request_target' ||
       startsWith(github.event.comment.body, 'Run Python Examples_Flink')
-    runs-on: [self-hosted, ubuntu-20.04, highmem]
+    runs-on: [self-hosted, ubuntu-20.04, highmem22]
     timeout-minutes: 240
     name: ${{ matrix.job_name }} (${{ matrix.job_phrase }} ${{ matrix.python_version }})
     strategy: