add jenkinsfile

Jenkinsfile

@@ -0,0 +1,43 @@
+pipeline {
+  agent any
+  stages {
+    stage('Pre-Build') {
+      steps {
+        sh '''mix local.hex --force
+mix local.rebar --force'''
+      }
+    }
+    stage('Build') {
+      steps {
+        sh '''mix deps.get
+mix compile'''
+      }
+    }
+    stage('Unit') {
+      steps {
+        sh '''mix ecto.create
+mix ecto.migrate
+mix coveralls --trace --preload-modules'''
+      }
+    }
+    stage('Analysis') {
+      parallel {
+        stage('Credo') {
+          steps {
+            sh 'mix credo --strict --only=warnings,todo,fixme,consistency,readability'
+          }
+        }
+        stage('Lint') {
+          steps {
+            sh 'mix format --check-formatted'
+          }
+        }
+      }
+    }
+    stage('Save') {
+      steps {
+        junit '_build/junit.xml'
+      }
+    }
+  }
+}