Add Docker setup for a CivBuddy build environment with NodeJS v8

.gitattributes

@@ -1 +1,3 @@
 /resources/i18n/*.ftl linguist-language=INI
+
+/docker/.vimrc text eol=lf

.gitignore

@@ -8,3 +8,4 @@
 *.iml
 *.ipr
 *.iws
+/docker/.ssh/

docker/.vimrc

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+set bg=dark
+syn on

docker/Dockerfile

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+FROM node:8-buster
+
+COPY .vimrc /root
+COPY .ssh /root/.ssh/
+
+RUN  apt-get update && \
+     apt-get install -y vim man && \
+     chmod 644 /root/.vimrc && \
+     echo 'alias ll="ls -lF --color=auto"' >> /root/.bashrc && \
+     chmod 700 /root/.ssh && \
+     chmod 644 /root/.ssh/* && \
+     chmod 600 /root/.ssh/id_ed25519
+
+WORKDIR /build

docker/README.md

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+# docker
+
+This folder contains some supplementary files for setting up a Docker environment on the local machine for building
+CivBuddy. It is not part of the CivBuddy app.
+
+Prerequisites:
+
+1. [Add SSH keys to GitHub](https://docs.github.com/en/authentication/connecting-to-github-with-ssh)
+2. Provide them in /docker/.ssh/ so that they can be included with the container
+
+In this folder:
+
+- `docker build -t civbuddy-node:8 --progress plain .`
+- `docker run --rm -it -vC:\path\to\civbuddy:/build --entrypoint=/bin/bash civbuddy-node:8`
+- `cd /build`
+- `npm install`
+- `npm run build` (or whatever other command)