CI: support Jenkins

.Jenkinsfile

@@ -0,0 +1,50 @@
+pipeline {
+    agent { label 'docker' }
+
+    environment {
+        ROLES_VERSION = build.getEnvironment(listener).get('GIT_COMMIT')
+    }
+
+    stages {
+        stage('Build tagged docker image') {
+            when {
+                buildingTag()
+            }
+            steps {
+                script {
+                    def im = docker.build("evolix/ansible-roles:build${env.BUILD_ID}", "gbp")
+                    im.inside {
+                        sh 'echo Test needed'
+                    }
+                    def version = TAG_NAME
+                    def versions = version.split('\\.')
+                    def major = versions[0]
+                    def minor = versions[0] + '.' + versions[1]
+                    def patch = version.trim()
+                 /* No crendentials yet
+                    im.push(major)
+                    im.push(minor)
+                    im.push(patch)
+                  */
+                }
+            }
+        }
+
+        stage('Build tagged docker image') {
+            when {
+                branch 'unstable'
+            }
+            steps {
+                script {
+                    def im = docker.build("evolix/ansible-roles:build${env.BUILD_ID}", "gbp")
+                    im.inside {
+                        sh 'echo Test needed'
+                    }
+                 /* No crendentials yet
+                    im.push('latest')
+                  */
+                }
+            }
+        }
+    }
+}