regression: add Jenkinsfile

Signed-off-by: Javi Fontan <jfontan@gmail.com>

Jenkinsfile

@@ -0,0 +1,54 @@
+pipeline {
+  agent {
+    kubernetes {
+      label 'regression-gitbase'
+      inheritFrom 'performance'
+      defaultContainer 'regression-gitbase'
+      containerTemplate {
+        name 'regression-gitbase'
+        image 'srcd/regression-gitbase:v0.2.0'
+        ttyEnabled true
+        command 'cat'
+      }
+    }
+  }
+  environment {
+    GOPATH = "/go"
+    GO_IMPORT_PATH = "github.com/src-d/regression-gibase"
+    GO_IMPORT_FULL_PATH = "${env.GOPATH}/src/${env.GO_IMPORT_PATH}"
+  }
+  triggers { pollSCM('0 0,12 * * *') }
+  stages {
+    stage('Run') {
+      when { branch 'master' }
+      steps {
+        sh '/bin/regression --complexity=2 --csv local:HEAD'
+      }
+    }
+    stage('Plot') {
+      when { branch 'master' }
+      steps {
+        script {
+          plotFiles = findFiles(glob: "plot_*.csv")
+          plotFiles.each {
+            echo "plot ${it.getName()}"
+            sh "cat ${it.getName()}"
+            plot(
+              group: 'performance',
+              csvFileName: it.getName(),
+              title: it.getName(),
+              numBuilds: '100',
+              style: 'line',
+              csvSeries: [[
+                displayTableFlag: false,
+                exclusionValues: '',
+                file: it.getName(),
+                inclusionFlag: 'OFF',
+              ]]
+            )
+          }
+        }
+      }
+    }
+  }
+}