ci: Build in Kubernetes

Can't use the official Zola container image because it doesn't have a
shell, so Jenkins can't run commands in it.

ci/Containerfile

@@ -1,15 +0,0 @@
-FROM alpine
-
-RUN echo jenkins:*:3000018:3000017::/var/lib/jenkins:/bin/bash >> /etc/passwd
-
-RUN apk update && \
-  apk add zola --repository http://dl-cdn.alpinelinux.org/alpine/edge/community/ && \
-  apk add \
-    openssh-client-default \
-    python3 \
-    py3-ruamel.yaml \
-    rsync \
-    && \
-  rm -rf /var/cache/apk/*
-
-COPY ssh_known_hosts /etc/ssh/ssh_known_hosts

ci/Jenkinsfile

@@ -2,9 +2,8 @@
 
 pipeline {
     agent {
-        dockerfile {
+        kubernetes {
-            dir 'ci'
+            yamlFile 'ci/podTemplate.yaml'
-            filename 'Containerfile'
         }
     }
 
@@ -12,22 +11,29 @@ pipeline {
         disableConcurrentBuilds()
     }
 
-    triggers {
+    environment {
-        pollSCM ''
+        HOME = "${env.WORKSPACE}"
     }
 
     stages {
 
         stage('Build') {
             steps {
-                sh '. ci/build.sh'
+                container('zola') {
+                    sh 'zola build --base-url /'
+                }
+                container('python') {
+                    sh '. ci/build.sh'
+                }
             }
         }
 
         stage('Publish') {
             steps {
-                sshagent(['jenkins-web']) {
+                container('rsync') {
-                    sh '. ci/publish.sh'
+                    sshagent(['jenkins-web']) {
+                        sh '. ci/publish.sh'
+                    }
                 }
             }
         }

ci/build.sh

@@ -1,5 +1,4 @@
-zola build --base-url /
+python3 -m pip install --user ruamel.yaml
-
 python3 /dev/fd/3 < songquotes.yml > public/songquotes.json 3<<EOF
 from ruamel.yaml import safe_load as load
 from json import dump

ci/podTemplate.yaml

@@ -0,0 +1,20 @@
+spec:
+  securityContext:
+    runAsUser: 1000
+  containers:
+  - name: zola
+    image: git.pyrocufflink.net/containerimages/zola
+  - name: python
+    image: docker.io/python:3.10
+    command:
+    - python
+    args:
+    - -c
+    - import signal; signal.pause()
+  - name: rsync
+    image: git.pyrocufflink.net/containerimages/rsync
+    command:
+    - python3
+    args:
+    - -c
+    - import signal; signal.pause()