ci: move build scratch off node runtime storage

Jenkinsfile

@@ -1,11 +1,16 @@
 pipeline {
   agent {
     kubernetes {
+      // Keep build I/O off the node's runtime USB drive.
+      workspaceVolume dynamicPVC(accessModes: 'ReadWriteOnce', requestsSize: '20Gi', storageClassName: 'ci-scratch')
       defaultContainer 'go-tester'
       yaml """
 apiVersion: v1
 kind: Pod
 spec:
+  securityContext:
+    fsGroup: 1000
+    fsGroupChangePolicy: OnRootMismatch
   nodeSelector: {kubernetes.io/arch: arm64, node-role.kubernetes.io/worker: "true"}
   affinity:
     nodeAffinity:
@@ -46,11 +51,17 @@ spec:
       command: ["cat"]
       tty: true
       volumeMounts: [{name: workspace-volume, mountPath: /home/jenkins/agent}]
-  volumes: [{name: workspace-volume, emptyDir: {}}]
 """
     }
   }
   environment {
+    PIP_CACHE_DIR = '/home/jenkins/agent/.cache/pip'
+    NPM_CONFIG_CACHE = '/home/jenkins/agent/.cache/npm'
+    SONAR_USER_HOME = '/home/jenkins/agent/.cache/sonar'
+    TMPDIR = '/home/jenkins/agent/.cache/tmp'
+    GOCACHE = '/home/jenkins/agent/.cache/go-build'
+    GOMODCACHE = '/home/jenkins/agent/.cache/go-mod'
+    GOTMPDIR = '/home/jenkins/agent/.cache/go-tmp'
     SUITE_NAME = 'pegasus'
     PUSHGATEWAY_URL = 'http://platform-quality-gateway.monitoring.svc.cluster.local:9091'
     SONARQUBE_HOST_URL = 'http://sonarqube.quality.svc.cluster.local:9000'
@@ -70,6 +81,11 @@ spec:
     pollSCM('H/5 * * * *')
   }
   stages {
+    stage('Prepare build scratch') {
+      steps {
+        sh 'mkdir -p /home/jenkins/agent/.cache/tmp /home/jenkins/agent/.cache/go-tmp'
+      }
+    }
     stage('Checkout') {
       steps {
         checkout scm