ci: Begin Jenkins build pipeline

ci/Jenkinsfile

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+pipeline {
+    agent {
+        kubernetes {
+            yamlFile 'ci/podTemplate.yaml'
+            yamlMergeStrategy merge()
+            defaultContainer 'buildah'
+        }
+    }
+
+    stages {
+        stage('Gentoo Stage 3') {
+            steps {
+                sh 'sh -e image-build/gentoo-stage3.sh'
+            }
+        }
+
+        stage('Base') {
+            steps {
+                sh 'sh -e image-build/base.sh'
+            }
+        }
+
+        stage('Cross') {
+            steps {
+                sh 'sh -e image-build/cross.sh'
+            }
+        }
+
+        stage('Build') {
+            steps {
+                sh 'sh -e image-build/build.sh'
+            }
+        }
+
+        stage('Push') {
+            steps {
+                withEnv([
+                    "REGISTRY_AUTH_FILE=${env.WORKSPACE_TMP}/auth.json"
+                ]) {
+                    withCredentials([usernamePassword(
+                        credentialsId: 'jenkins-packages',
+                        usernameVariable: 'BUILDAH_USERNAME',
+                        passwordVariable: 'BUILDAH_PASSWORD',
+                    )]) {
+                        sh """
+                            buildah login \
+                            --username \${BUILDAH_USERNAME} \
+                            --password \${BUILDAH_PASSWORD} \
+                            git.pyrocufflink.net
+                        """
+                    }
+                    sh 'buildah push aimee-os.org/build/cross-aarch64-unknown-linux-gnu git.pyrocufflink.net/aimeeos/build/cross-aarch64-unknown-linux-gnu'
+                }
+            }
+        }
+    }
+}

ci/podTemplate.yaml

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+spec:
+  containers:
+  - name: buildah
+    image: quay.io/containers/buildah:v1
+    command:
+    - sh
+    - -c
+    - |
+      trap 'kill $!; exit' TERM
+      rm -f ~/.config/containers/storage.conf
+      sleep infinity &
+      wait
+    securityContext:
+      runAsUser: 1000
+      runAsGroup: 1000
+    resources:
+      limits:
+        github.com/fuse: 1
+  tolerations:
+  - key: du5t1n.me/jenkins