add generic Jenkinsfile for building task images

dockerfiles/tasks/Jenkinsfile

@@ -0,0 +1,25 @@
+pipeline {
+    agent any
+    parameters {
+        choice(
+            name: 'IMAGE',
+            choices: ['ansible', 'apidocjs', 'composer', 'mondrian', 'php'],
+            description: 'What image would you like to build?'
+        )
+    }
+    stages {
+        stage('Build Image') {
+            steps {
+                //git credentialsId: 'f1f58215-c789-44a2-9b72-50e4425cb061', url: 'ssh://git@git.xai-corp.net:10022/xai-corp.net/provisioning.git'
+                checkout scm
+                sh 'ls'
+
+                dir("dockerfiles/tasks/$params.IMAGE") {
+                    sh 'chmod +x build.sh && ls -l'
+
+                    sh './build.sh'
+                }
+            }
+        }
+    }
+}