add jenkins declarative pipeline for all stages CI/CD APK

Jenkinsfile

@@ -0,0 +1,80 @@
+pipeline {
+    agent any
+
+    stages {
+        stage('Init') {
+            steps {
+                checkout([
+                    $class: 'GitSCM',
+                    branches: [[name: '*/homework_proguard']],
+                    doGenerateSubmoduleConfigurations: false,
+                    extensions: [[$class: 'CleanCheckout']],
+                    submoduleCfg: [],
+                    userRemoteConfigs: [[
+                        url: 'https://github.com/MrOzOn/HealthDiary',
+                        credentialsId: 'CRED_FOR_GITHUB'
+                        ]]])
+                sh 'docker version'
+            }
+        }
+        stage('Build') {
+            agent {
+                docker {
+                    image 'gitlab-ci-java8'
+                    args '-u root:root'
+                }
+            }
+            // agent { dockerfile true }
+            steps {
+                sh './gradlew assembleDebug'
+            }
+        }
+        stage('Static Analysis') {
+            agent {
+                docker {
+                    image 'gitlab-ci-java8'
+                    args '-u root:root'
+                }
+            }
+            steps {
+                sh './gradlew detekt'
+                sh './gradlew lintDebug'
+            }
+        }
+        stage('Test') {
+            agent {
+                docker {
+                    image 'gitlab-ci-java8'
+                    args '-u root:root'
+                }
+            }
+            steps {
+                sh './gradlew testDebugUnitTest'
+                sh './gradlew jacocoTestDebugUnitTestReport'
+            }
+        }
+        stage('Signing APK') {
+            agent {
+                docker {
+                    image 'gitlab-ci-java8'
+                    args '-u root:root'
+                }
+            }
+            steps {
+                prepareProperties()
+                sh './gradlew assembleRelease'
+            }
+        }
+    }
+}
+
+def prepareProperties() {
+    def propertiesPath = "/.keystore"
+    sh "mkdir -p ${env.HOME}${propertiesPath}"
+    withCredentials([file(credentialsId: 'KEYSTORE_PROPERTIES', variable: 'propertiesFile')]) {
+        sh "cp -f ${propertiesFile} ${env.HOME}${propertiesPath}/keystore.properties"
+    }
+    withCredentials([file(credentialsId: 'KEYSTORE_JKS', variable: 'keystore')]) {
+        sh "cp -f ${keystore} ${env.HOME}${propertiesPath}/learn_otus.jks"
+    }
+}