fix(Healthcheck): Fixues docker healthcheck

Points dockerfile to location of new healthcheck script

Fixes #699

Dockerfile

@@ -16,8 +16,6 @@ ARG PORT=8000
 ENV PORT $PORT
 EXPOSE $PORT
 
-HEALTHCHECK --interval=5s CMD node healthcheck.js
-
 RUN npm install --only=production --no-package-lock && \
     npm cache clean --force
 
@@ -27,4 +25,6 @@ COPY ./public ./dist/public
 
 WORKDIR /app/dist
 
+HEALTHCHECK --interval=5s CMD node healthcheck.js
+
 CMD [ "node", "server.js" ]

src/healthcheck.ts

@@ -0,0 +1,22 @@
+import http from "http";
+
+const options = {
+  host: "localhost",
+  port: process.env.PORT,
+  method: "GET",
+  timeout: 2000,
+  path: "/ping",
+};
+
+http
+  .request(options, (response) => {
+    if (response.statusCode === 200) return process.exit(0);
+    return process.exit(1);
+  })
+  .on("error", (error) => {
+    console.log(
+      `Healthcheck failed to ${options.host}:${options.port}/ping: ${error}`
+    );
+    return process.exit(1);
+  })
+  .end();