Two stage docker build (#18)

Dockerfile

@@ -1,18 +1,24 @@
-FROM node:22-slim
-RUN apt update \
-  && apt --no-install-recommends install -y curl \
-  && apt clean
+# Our first stage, that is the Builder
+FROM node:22-slim AS thumbnail-api-builder
 WORKDIR /opt/thumbnail-api
 COPY src /opt/thumbnail-api/src
 COPY package.json /opt/thumbnail-api
 COPY package-lock.json /opt/thumbnail-api
 COPY tsconfig.json /opt/thumbnail-api
 COPY eslint.config.mjs /opt/thumbnail-api
+RUN npm install --ignore-scripts && npm run clean && npm run build
+
+FROM node:22-slim AS thumbnail-api-prod
+RUN apt update \
+  && apt --no-install-recommends install -y curl \
+  && apt clean
+WORKDIR /opt/thumbnail-api
+COPY package.json .
+COPY package-lock.json .
+COPY --from=thumbnail-api-builder /opt/thumbnail-api/dist /opt/thumbnail-api/dist
 RUN chown -R node:node /opt/thumbnail-api
 USER node
 EXPOSE 3000
 HEALTHCHECK CMD ["curl", "-f", "http://localhost:3000/health"]
-RUN npm run clean \
-    && npm ci --ignore-scripts \
-    && npm run build
+RUN npm install --omit=dev --omit=optional --ignore-scripts
 CMD ["npm", "run", "start", "-s"]

package.json

@@ -4,7 +4,7 @@
   "private": true,
   "scripts": {
     "build": "tsc",
-    "clean": "rm -r dist thumbnail-api.zip 2> /dev/null ; exit 0",
+    "clean": "rm -r dist 2> /dev/null ; exit 0",
     "start": "node dist/src/main.js",
     "lint": "npx eslint",
     "format": "prettier --ignore-path .gitignore --write \"**/*.+(js|ts|json)\"",