Add a docker environment to verify the plugin in a clean room

.dockerignore

@@ -0,0 +1,4 @@
+.git/
+.lsp/
+.clj-kondo/
+.cpcache/

CONTRIBUTING.adoc

@@ -14,4 +14,6 @@ Your changes and evaluations only apply to the in memory copy of Conjure, use `m
 
 Once you're happy with your changes, you can (maybe) write some tests and execute them with `make test`. CircleCI will also run them for you.
 
+You can run `scripts/docker.sh` to drop into a fresh Ubuntu based Neovim environment with Conjure pre-installed from your working directory. This can be used to verify your changes in a clean room environment.
+
 If you'd like to contribute or are having issues please don't hesitate to get in touch with me (Olical / Oliver Caldwell) on twitter, email or Clojurians Slack.

Dockerfile

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+FROM ubuntu:21.10
+
+RUN apt-get update
+RUN apt-get upgrade -y
+RUN apt-get install -y software-properties-common
+
+RUN add-apt-repository ppa:neovim-ppa/stable
+RUN apt-get update
+RUN apt-get install -y neovim
+
+ADD . /root/.local/share/nvim/site/pack/conjure/start/conjure
+
+CMD nvim

scripts/docker.sh

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+#!/usr/bin/env bash
+
+docker build . -t conjure
+docker run -ti --rm conjure