Add Jenkinsfile

* allows Jenkins to automatically discovery build jobs(s) from GH
* add repo.yml to allow balenaCI to version
* add README.md stub

Change-type: patch

Jenkinsfile

@@ -0,0 +1,54 @@
+
+pipeline {
+
+    agent any
+
+    options {
+        timestamps()
+        ansiColor('xterm')
+        buildDiscarder logRotator(numToKeepStr: '100')
+        disableConcurrentBuilds()
+        timeout(activity: true, time: 1, unit: 'DAYS')
+    }
+
+    parameters {
+        string defaultValue: 'master', description: 'Build scaffold Git branch', name: 'BRANCH', trim: true
+        string defaultValue: 'master', description: 'QEMU Git branch', name: 'RELEASE_BRANCH', trim: true
+        string defaultValue: 'balena-io', description: 'GitHub org', name: 'ACCOUNT', trim: true
+        string defaultValue: 'qemu', description: 'GitHub repository', name: 'REPO', trim: true
+        string defaultValue: '', description: '(e.g.) v5.2.0+balena1', name: 'QEMU_VERSION', trim: true
+        string defaultValue: '', description: 'Git commit hash', name: 'RELEASE_COMMIT', trim: true
+        credentials credentialType: 'org.jenkinsci.plugins.plaincredentials.impl.StringCredentialsImpl', defaultValue: '169db7d9-d27d-42ca-92fb-215663537c34', description: 'GitHub access token credentials', name: 'GIT_TOKEN_CREDENTIALS', required: true
+        credentials credentialType: 'com.cloudbees.jenkins.plugins.sshcredentials.impl.BasicSSHUserPrivateKey', defaultValue: 'a2d8eaf4-a373-4efa-a9e3-c331a3687e72', description: 'GitHub SSH credentials', name: 'GIT_SSH_CREDENTIALS', required: true
+    }
+
+    stages {
+
+        stage('scm') {
+            steps {
+                checkout([
+                    $class: 'GitSCM',
+                    branches: [[name: '*/${BRANCH}']],
+                    doGenerateSubmoduleConfigurations: false,
+                    extensions: [],
+                    submoduleCfg: [],
+                    userRemoteConfigs: [[
+                        credentialsId: GIT_SSH_CREDENTIALS, 
+                        url: '[email protected]:${ACCOUNT}/${REPO}.git'
+                    ]
+                ]])
+            }
+        }
+
+        stage('build') {
+            steps {
+                withCredentials([string(
+                    credentialsId: GIT_TOKEN_CREDENTIALS,
+                    variable: 'ACCESS_TOKEN'
+                )]) {
+                    sh returnStdout: true, script: 'automation/jenkins-build.sh'
+                }
+            }
+        }
+    }
+}

README.md

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+# qemu
+> build QEMU with additional QEMU_EXECVE flag that persists emulator after an execve
+

repo.yml

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+---
+type: "generic"