Begin Jenkins CI pipeline

ci/Jenkinsfile

@@ -0,0 +1,57 @@
+// vim: set ft=groovy sw=4 ts=4 sts=4 et :
+
+pipeline {
+    agent {
+        kubernetes {
+            yamlFile 'ci/podTemplate.yaml'
+            defaultContainer 'buildroot'
+            workspaceVolume persistentVolumeClaimWorkspaceVolume(
+                claimName: 'jenkins-ws-pythonctnr'
+            )
+        }
+    }
+
+    options {
+        buildDiscarder logRotator(numToKeepStr: '5')
+        disableConcurrentBuilds()
+    }
+
+    parameters {
+        booleanParam \
+            name: 'Clean',
+            description: 'Clean the workspace and perform a full rebuild'
+    }
+
+    stages {
+        stage('Prepare') {
+            steps {
+                script {
+                    if (params.Clean) {
+                        sh 'rm -rf _build'
+                    }
+                }
+                checkout poll: false, scm: [
+                    $class: 'GitSCM',
+                    branches: [[name: '2022.05.x']],
+                    doGenerateSubmoduleConfigurations: false,
+                    userRemoteConfigs: [[url: 'git://git.buildroot.net/buildroot']],
+                    extensions: [
+                        [
+                            $class: 'RelativeTargetDirectory',
+                            relativeTargetDir: 'buildroot',
+                        ],
+                    ],
+                ]
+            }
+        }
+
+        stage('Build') {
+            steps {
+                sh 'make -C buildroot O="${PWD}"/_build BR2_EXTERNAL="${PWD}" pythonctnr_defconfig'
+                sh 'make -C _build'
+            }
+        }
+
+    }
+
+}

ci/podTemplate.yaml

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+spec:
+  securityContext:
+    fsGroup: 1000
+  containers:
+  - name: jnlp
+  - 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