chore: Add dev Dockerfile

Author: jcs090218

Dockerfile

@@ -0,0 +1,18 @@
+FROM nixos/nix
+
+# Install Emacs
+RUN nix-env -iA nixpkgs.emacs
+
+# Install Node.JS
+RUN nix-env -iA nixpkgs.nodejs
+
+# Move the whole project in.
+WORKDIR /cli
+COPY . .
+
+# Install package dependencies.
+WORKDIR /cli
+RUN npm install --include=dev
+
+# Expose it.
+ENV PATH="${PATH}:/cli/bin"