wip: Add Jenkins build pipeline

ci/Jenkinsfile

@@ -0,0 +1,20 @@
+pipeline {
+    agent {
+        kubernetes {
+            yamlFile 'ci/podTemplate.yaml'
+            yamlMergeStrategy merge()
+            workspaceVolume persistentVolumeClaimWorkspaceVolume(
+                claimName: 'buildroot-kitchenos'
+            )
+            defaultContainer 'build'
+        }
+    }
+
+    stages {
+        stage('Build') {
+            steps {
+                sh '. ci/build.sh'
+            }
+        }
+    }
+}

ci/build.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+if [ ! -f _build/.config ]; then
+    make O="${PWD}"/_build BR2_EXTERNAL="${PWD}" kitchenos_defconfig
+fi
+
+make -C _build

ci/podTemplate.yaml

@@ -0,0 +1,12 @@
+spec:
+  containers:
+  - name: build
+    image: git.pyrocufflink.net/containerimages/buildroot
+    volumeMounts:
+    - mountPath: /etc/ssh/ssh_known_hosts
+      name: ssh-known-hosts
+      subPath: ssh_known_hosts
+  volumes:
+  - name: ssh-known-hosts
+    configMap:
+      name: ssh-known-hosts