Add Dockerfile and Jenkinsfile

This is the first step in improving my coleslaw builds. For this commit the only
thing that it does is build the project into a staging directory.

Dockerfile

@@ -0,0 +1,14 @@
+FROM ubuntu:latest
+
+RUN apt-get update && apt-get upgrade -y && apt-get install -y curl jq rsync
+
+RUN curl -sL `curl -s https://api.github.com/repos/roswell/roswell/releases/latest \
+    | jq -r '.assets | .[] | select(.name|test("deb$")) | .browser_download_url'` \
+    --output roswell.deb \
+    && apt install -y ./roswell.deb
+
+RUN ros install coleslaw-org/coleslaw && coleslaw --help
+RUN curl -fsSkL https://raw.github.com/rejeep/evm/master/go | bash
+RUN evm install emacs-27.1 && evm use emacs-27.1
+
+ENV PATH="/root/.evm/bin:/root/.roswell/bin:$PATH"

Jenkinsfile

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+pipeline {
+    agent { dockerfile true }
+
+    stages {
+        stage('Build') {
+            steps {
+                sh coleslaw
+            }
+        }
+    }
+}