ci: Switch to K8s build agent

ci/Dockerfile

@@ -1,27 +0,0 @@
-FROM registry.fedoraproject.org/fedora:30
-
-ARG UID
-ARG GID
-
-RUN groupadd -g ${GID} jenkins \
-    && useradd -u ${UID} -g ${GID} -m -d /var/lib/jenkins -l jenkins
-
-RUN dnf install -y \
-    bc \
-    bzip2 \
-    cpio \
-    diffutils \
-    g++ \
-    gcc \
-    git \
-    make \
-    ncurses-devel \
-    openssh-clients \
-    patch \
-    perl-ExtUtils-MakeMaker \
-    perl-Thread-Queue \
-    rsync \
-    systemd \
-    wget \
-    which \
-    && dnf clean all

ci/Jenkinsfile

@@ -2,16 +2,12 @@
 
 pipeline {
     agent {
-        dockerfile {
+        kubernetes {
-            dir 'ci'
+            yamlFile 'ci/podTemplate.yaml'
-            args '''
+            defaultContainer 'buildroot'
-            -v /etc/ssh/ssh_known_hosts:/etc/ssh/ssh_known_hosts
+            workspaceVolume persistentVolumeClaimWorkspaceVolume(
-            --pids-limit 16384
+                claimName: 'jenkins-ws-metricspi'
-            '''
+            )
-            additionalBuildArgs '''\
-            --build-arg UID=$(id -u) \
-            --build-arg GID=$(id -g) \
-            '''
         }
     }
 
@@ -20,10 +16,6 @@ pipeline {
         disableConcurrentBuilds()
     }
 
-    triggers {
-        pollSCM ''
-    }
-
     parameters {
         booleanParam \
             name: 'Clean',
@@ -32,6 +24,9 @@ pipeline {
 
     environment {
         BUILDROOT_SRC = "${env.WORKSPACE}/buildroot"
+        TMPDIR = "${env.WORKSPACE_TMP}"
+        TEMP = "${env.WORKSPACE_TMP}"
+        TMP = "${env.WORKSPACE_TMP}"
     }
 
     stages {

ci/podTemplate.yaml

@@ -0,0 +1,20 @@
+spec:
+  securityContext:
+    fsGroup: 1000
+  containers:
+  - name: buildroot
+    image: registry.pyrocufflink.blue/buildroot
+    command:
+    - sleep
+    - infinity
+    volumeMounts:
+    - name: tmp
+      mountPath: /tmp
+    securityContext:
+      readOnlyRootFilesystem: true
+      runAsUser: 1000
+  volumes:
+  - name: tmp
+    emptyDir:
+      medium: Memory
+      sizeLimit: 100Mi