Make build and Dockerfile according to serlo's practices

cache-worker/Dockerfile

@@ -1,10 +1,23 @@
-FROM node:12
-ENV CACHE_KEYS all
-ENV CACHE_KEYS_RETRIES 2
-WORKDIR /app
+FROM node:12 as dev-dependencies
+WORKDIR /usr/src/app
+COPY package.json .
+COPY yarn.lock .
+RUN yarn --frozen-lockfile --production=false --silent
+
+FROM node:12 as prod-dependencies
+WORKDIR /usr/src/app
+ENV NODE_ENV production
 COPY package.json .
 COPY yarn.lock .
-COPY src/ ./src
+RUN yarn --frozen-lockfile --production=true --silent
+
+FROM dev-dependencies as build
+COPY src src
 COPY index.ts .
-RUN yarn install --frozen-lockfile
-CMD ["yarn", "updatecache"]
+RUN yarn build
+
+FROM prod-dependencies as release
+ENV CACHE_KEYS all
+ENV CACHE_KEYS_RETRIES 2
+COPY --from=build /usr/src/app/dist dist
+ENTRYPOINT ["node", "dist"]

cache-worker/package.json

@@ -6,7 +6,8 @@
   "author": "Serlo Education e.V.",
   "main": "index.ts",
   "scripts": {
-    "updatecache": "yarn ts-node index.ts"
+    "updatecache": "ts-node index.ts",
+    "build": "tsdx build --target node -i index.ts"
   },
   "dependencies": {
     "graphql": "^15.0.0",
@@ -16,7 +17,8 @@
     "typescript": "^4.0.0"
   },
   "devDependencies": {
-    "@types/node": "^14.0.0"
+    "@types/node": "^14.0.0",
+    "tsdx": "^0.14.0"
   },
   "engines": {
     "node": "^12.0.0"