Initial Dockerfile and Jenkinsfile

Dockerfile

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+#FROM - Image to start building on.
+FROM ubuntu:14.04
+
+#MAINTAINER - Identifies the maintainer of the dockerfile.
+MAINTAINER jesse.isler@gmail.com
+
+#RUN - Runs a command in the container
+RUN echo "Hello world" > /tmp/hello_world.txt
+
+#CMD - Identifies the command that should be used by default when running the image as a container.
+CMD ["cat", "/tmp/hello_world.txt"]

Jenkinsfile

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+pipeline {
+    agent { dockerfile true }
+    stages {
+        stage('Test') {
+            steps {
+                echo "Build has worked!"
+            }
+        }
+    }
+}