Dockerize Application

Now poll.horse is available as a docker image!
To persist data, mount `/data` to a host directory.
A config file can be specified via binding `/usr/src/app/config.json` to
a config file on the host.

.dockerignore

@@ -0,0 +1,33 @@
+**/.classpath
+**/.dockerignore
+**/.env
+**/.git
+**/.gitignore
+**/.project
+**/.settings
+**/.toolstarget
+**/.vs
+**/.vscode
+**/*.*proj.user
+**/*.dbmdl
+**/*.jfm
+**/charts
+**/docker-compose*
+**/compose*
+**/Dockerfile*
+**/node_modules
+**/npm-debug.log
+**/obj
+**/secrets.dev.yaml
+**/values.dev.yaml
+README.md
+CHANGELOG.md
+API.md
+LICENSE
+
+data/
+dist/
+node_modules/
+.editorconfig
+config*.js*
+Procfile

.vscode/launch.json

@@ -13,6 +13,13 @@
             ],
             "restart": true,
             "type": "pwa-node"
+        },
+        {
+            "name": "Docker Node.js Launch",
+            "type": "docker",
+            "request": "launch",
+            "preLaunchTask": "docker-run: debug",
+            "platform": "node"
         }
     ]
 }

.vscode/tasks.json

@@ -0,0 +1,39 @@
+{
+	"version": "2.0.0",
+	"tasks": [
+		{
+			"type": "docker-build",
+			"label": "docker-build",
+			"platform": "node",
+			"dockerBuild": {
+				"dockerfile": "${workspaceFolder}/Dockerfile",
+				"context": "${workspaceFolder}",
+				"pull": true
+			}
+		},
+		{
+			"type": "docker-run",
+			"label": "docker-run: release",
+			"dependsOn": [
+				"docker-build"
+			],
+			"platform": "node"
+		},
+		{
+			"type": "docker-run",
+			"label": "docker-run: debug",
+			"dependsOn": [
+				"docker-build"
+			],
+			"dockerRun": {
+				"env": {
+					"DEBUG": "*",
+					"NODE_ENV": "development"
+				}
+			},
+			"node": {
+				"enableDebugging": true
+			}
+		}
+	]
+}

Dockerfile

@@ -0,0 +1,21 @@
+FROM node:lts-alpine
+WORKDIR /usr/src/app
+
+# Add Tini
+RUN apk add --update tini
+
+# Install and build application
+COPY ["package.json", "package-lock.json*", "npm-shrinkwrap.json*", "./"]
+RUN npm set-script prepublish ""
+RUN npm install --silent && npm cache clean --silent --force
+COPY . .
+RUN npm test
+RUN npm run build
+RUN rm -rf src utils .eslintignore .eslintrc.json .mocharc.json test tsconfig.json
+RUN npm prune --production --silent
+RUN chown -R node /usr/src/app
+RUN mv node_modules ../
+ENV PORT=6969
+RUN mkdir -p /data && chown -R node /data
+USER node
+ENTRYPOINT ["/sbin/tini", "--", "node", "dist/main", "--port", "env:PORT", "--data-directory", "/data"]