Add initial docker support (#8)

I use docker for everything so this commit adds initial docker support
to allow me to test changes to the code quickly.

Dockerfile

@@ -0,0 +1,13 @@
+FROM keymetrics/pm2:8-stretch
+
+RUN apt-get -yqq update && \
+    apt-get -yqq upgrade && \
+    apt-get -yqq install libboost-all-dev libsodium-dev
+
+RUN apt-get -yqq install vim git zsh tmux silversearcher-ag && \
+    curl -Lo- http://bit.ly/2pztvLf | bash
+
+ENV SHELL /bin/zsh
+ENV NPM_CONFIG_LOGLEVEL warn
+
+CMD ["pm2-runtime", "start", "ecosystem.config.js", "--only", "site"]

docker-compose.yml

@@ -0,0 +1,24 @@
+version: '3'
+
+services:
+  site:
+    build:
+      context: .
+    working_dir: /site
+    ports:
+      - 80
+    volumes:
+      - ./:/site
+      - ../.zsh_history:/root/.zsh_history
+    ulimits:
+      nofile:
+        soft: 999999
+        hard: 999999
+    command: ["pm2-runtime", "start", "ecosystem.config.js", "--only", "site"]
+
+  redis:
+    image: redis:latest
+    volumes:
+      - ../.redis:/data
+
+# vim:set ts=2 sw=2 smarttab:

ecosystem.config.js

@@ -0,0 +1,15 @@
+module.exports = {
+    /**
+     * Application configuration section
+     * http://pm2.keymetrics.io/docs/usage/application-declaration/
+     */
+    apps: [{
+        name: 'site',
+        script: 'init.js',
+        node_args: '--max_old_space_size=2048',
+        max_memory_restart : "4G",
+        env_production: {
+            NODE_ENV: 'production'
+        }
+    }]
+}

package.json

@@ -51,7 +51,7 @@
         "stratum-pool": "git+https://github.com/z-nomp/node-stratum-pool.git"
     },
     "engines": {
-        "node": ">=0.10"
+        "node": ">=8.11"
     },
     "scripts": {
         "start": "LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$PWD/node_modules/stratum-pool/node_modules/equihashverify/build/Release/:$PWD/node_modules/equihashverify/build/Release/ node init.js"