Add docker environment for local development (#257)

* Add docker environment

* Add document of docker

* Move docker files

* Change context

* Move git submodule command to entrypoint.sh

* Update README

README.md

@@ -87,6 +87,22 @@ separately to build the frontend. When making changes to the frontend it
 should be enough to simply run `nimble frontend` again to rebuild. This command
 will also build the SASS ``nimforum.scss`` file in the `public/css` directory.
 
+### With docker
+
+You can easily launch site on localhost if you have `docker` and `docker-compose`.
+You don't have to setup dependencies (libsass, sglite, pcre, etc...) on you host PC.
+
+To get up and running:
+
+```bash
+cd docker
+docker-compose build
+docker-compose up
+```
+
+And you can access local NimForum site.
+Open http://localhost:5000 .
+
 # Troubleshooting
 
 You might have to run `nimble install karax@#5f21dcd`, if setup fails

docker/Dockerfile

@@ -0,0 +1,14 @@
+FROM nimlang/nim:1.2.6-ubuntu
+
+RUN apt-get update -yqq \
+    && apt-get install -y --no-install-recommends \
+               libsass-dev \
+               sqlite3 \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+COPY . /app
+
+# install dependencies
+RUN nimble install -Y

docker/docker-compose.yml

@@ -0,0 +1,12 @@
+version: "3.7"
+
+services:
+  forum:
+    build:
+      context: ../
+      dockerfile: ./docker/Dockerfile
+    volumes:
+      - "../:/app"
+    ports:
+      - "5000:5000"
+    entrypoint: "/app/docker/entrypoint.sh"

docker/entrypoint.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+set -eu
+
+git submodule update --init --recursive
+
+# setup
+nimble c -d:release src/setup_nimforum.nim
+./src/setup_nimforum --dev
+
+# build frontend
+nimble c -r src/buildcss
+nimble js -d:release src/frontend/forum.nim
+mkdir -p public/js
+cp src/frontend/forum.js public/js/forum.js
+
+# build backend
+nimble c src/forum.nim
+./src/forum