Gate for postcommit checks (#6116)

.github/workflows/gate_postcommits.yml

@@ -0,0 +1,54 @@
+name: Postcommits gate
+on:
+  schedule:
+    - cron: "*/5 * * * *"  # Every 5 minutes
+  workflow_dispatch:
+
+jobs:
+  switch_gate:
+    runs-on: ubuntu-latest
+    name: SwitchGate
+    steps:
+    - name: main
+      shell: bash
+      run: |
+        queue_size=$(curl -Ls -H "Accept: application/vnd.github+json" -H "Authorization: Bearer ${{github.token}}" -H "X-GitHub-Api-Version: 2022-11-28" \
+          https://api.github.com/repos/${{github.repository}}/actions/runs?per_page=1000\&page=1\&status=queued\&event=pull_request_target | \
+          jq '[.workflow_runs[] | {name,status,id,updated_at,"waiting_seconds":(now - (.updated_at | fromdate)), html_url}]' | \
+          jq '[.[] | select(.waiting_seconds > 600)] | length')
+        echo "Queue size: $queue_size"
+        if (( queue_size > 0 ));then
+          echo "Close gate for postcommits"
+          query='.runners[] | select(.labels[].name=="ghrun") | select( any([.labels[].name][]; .=="postcommit")) | .id'
+        else
+          echo "Open gate for postcommits"
+          query='.runners[] | select(.labels[].name=="ghrun") | select( all([.labels[].name][]; .!="postcommit")) | .id'
+        fi
+        
+        echo "Requesting a list of runners to update labels..."
+        j1=$(curl -Ls -H "Accept: application/vnd.github+json" -H "Authorization: Bearer ${{secrets.GH_PERSONAL_ACCESS_TOKEN}}" \
+          -H "X-GitHub-Api-Version: 2022-11-28" -w "%{http_code}\n" \
+          https://api.github.com/repos/${{github.repository}}/actions/runners?per_page=100\&page=1)
+        http_code=$(echo "$j1" | tail -n 1)
+        echo "Result code: $http_code"
+        if [ "$http_code" != "200" ];then
+          echo "HTTP result code is not 200, exiting"
+          echo "$j1"
+          exit 1
+        fi
+        # echo "$j1"
+        
+        echo "$j1" | sed '$d' | jq "$query" | while read x;do
+          echo "Runner: $x"
+          if (( queue_size > 0 ));then
+            curl -Ls -X DELETE -H "Accept: application/vnd.github+json" -H "Authorization: Bearer ${{secrets.GH_PERSONAL_ACCESS_TOKEN}}" \
+              -H "X-GitHub-Api-Version: 2022-11-28" \
+              https://api.github.com/repos/${{github.repository}}/actions/runners/$x/labels/postcommit
+          else
+            curl -Ls -X POST -H "Accept: application/vnd.github+json" -H "Authorization: Bearer ${{secrets.GH_PERSONAL_ACCESS_TOKEN}}" \
+              -H "X-GitHub-Api-Version: 2022-11-28" \
+              https://api.github.com/repos/${{github.repository}}/actions/runners/$x/labels \
+              -d '{"labels":["postcommit"]}'
+          fi
+        done
+        echo "Runner labels synchronized"