Dockerfile

feed/Dockerfile

@@ -1,32 +1,48 @@
 # Build a Docker container to run the feed
+
+#======================================================================
+# base - The base image containing the nodejs runtime
+#
+# Used by npm & final images
 FROM docker.ceres.area51.dev/area51/ubuntu:node-20.04 AS base
 
+#======================================================================
+# npm - contains all the required modules for both building & the final image
 FROM base AS npm
 
-WORKDIR /opt
+WORKDIR /work
+
+# package.json is needed by npm
+ADD feed/package.json /work/
+
+# These files rarely change
+ADD feed/.babelrc /work/
+ADD feed/.npmignore /work/
 
-ADD feed/package.json /opt/
-ADD feed/.babelrc /opt/
-ADD feed/.npmignore /opt/
+# Set our local npm repo for performance reasons
+RUN echo registry=https://nexus.ceres.area51.dev/repository/npm-group/ >~/.npmrc
 
-# Set our local repo then install the lot
-RUN echo registry=https://nexus.ceres.area51.dev/repository/npm-group/ >~/.npmrc &&\
-    npm install
+# Install all required modules for the build
+RUN npm install
 
-# Now install just the production modules (i.e. no dev ones), so the final image doesn't include those
+# Install just the production modules into /dist
 RUN mkdir /dist &&\
     cd /dist &&\
-    cp /opt/package.json . &&\
+    cp /work/package.json . &&\
     npm install --only=production
 
+#======================================================================
+# build - performs the actual build placing the final artifacts under /dist
 FROM npm AS build
 
-ADD feed/src/ /opt/src/
+ADD feed/src/ /work/src/
 
 RUN npm run build &&\
     cp -rp build /dist
 
+#======================================================================
+# Now build the final image with just nodejs and the build artifacts
 FROM base AS final
-WORKDIR /opt
-COPY --from=build /dist/ /opt/
+WORKDIR /work
+COPY --from=build /dist/ /work/
 CMD ["node","./build/index.js"]