Add docker image

Dockerfile

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+ARG REPO='https://git.shaunreed.com/shaunrd0/dot'
+FROM ubuntu:latest
+COPY . /dot
+ENV TERM=xterm-256color
+# Install additional packages we need
+RUN apt update -y && apt upgrade -y
+RUN apt install -y git stow vim tmux ranger clang wget curl golang-go
+RUN go install github.com/arl/gitmux@latest
+# Update submodules for plugins
+RUN cd /dot && git submodule update --init && cp .gitmux.conf.docker .gitmux.conf
+RUN rm ~/.bashrc && rm -rf /dot/.tmux/plugins/tmux-yank
+RUN cd /dot && stow -t /root .
+