Merge pull request #136 from outlyer-net/docker-image-shrink

Reduce docker image size

.dockerignore

@@ -0,0 +1,2 @@
+.git*
+README.md

Dockerfile

@@ -1,5 +1,4 @@
-FROM node:20-bookworm
-LABEL description="Script written in TypeScript that uploads CGM readings from LibreLink Up to Nightscout"
+FROM node:20-bookworm-slim AS build-stage
 
 # Create app directory
 RUN mkdir -p /usr/src/app
@@ -13,9 +12,20 @@ RUN npm install
 COPY . /usr/src/app
 
 # Run tests
-RUN npm run test
+RUN npm run test ; \
+    rm -r tests coverage
+
+# Compile
+RUN npm run build
 
-RUN rm -r tests
-RUN rm -r coverage
+# Remove devel-only dependencies
+RUN npm prune --omit dev
+
+FROM node:20-bookworm-slim
+LABEL description="Script written in TypeScript that uploads CGM readings from LibreLink Up to Nightscout"
+
+COPY --from=build-stage /usr/src/app /usr/src/app
+
+WORKDIR /usr/src/app
 
-CMD [ "npm", "start" ]
+CMD [ "npm", "run", "start-heroku" ]