Add jenkins build file

Jenkinsfile

@@ -0,0 +1,46 @@
+pipeline {
+    agent {
+        label 'linux'
+    }
+    options {
+        buildDiscarder(
+            logRotator(
+                numToKeepStr: '5'
+            )
+        )
+    }
+
+    stages {
+        step ("Build") {
+            script {
+                sh '''
+                #!/bin/bash
+
+                flutter pub get
+                flutter build linux
+                flutter build apk
+                '''
+            }
+        }
+        step ('Package') {
+            script {
+                sh '''
+                #!/bin/bash
+
+                cd build/linux/x64/release/bundle
+                tar -cvf ../../../../../linux.tgz ./
+                cd ../../../../app/outputs/flutter-apk
+                cp app-release.apk ../../../../
+                '''
+            }
+        }
+    }
+
+    post {
+        always {
+            archiveArtifacts artifacts: '*.tgz', fingerprint: true
+            archiveArtifacts artifacts: '*.apk', fingerprint: true
+            deleteDir()
+        }
+    }
+}