Restore original Dockerfile, fix CI stage

.github/workflows/docker.yml

@@ -58,7 +58,6 @@ jobs:
         with:
           context: .
           push: ${{ github.event_name != 'pull_request' }}
-          target: release
           cache-from: type=gha
           cache-to: type=gha,mode=max
           platforms: linux/amd64,linux/arm64,linux/arm/v7,linux/arm/v6

Dockerfile

@@ -1,20 +1,27 @@
+# syntax=docker/dockerfile:1
 
 FROM node:20-alpine
 
+# Use production node environment by default.
 ENV NODE_ENV production
 
 WORKDIR /app
 
-# Install dependencies
-COPY package.json package-lock.json* ./
-RUN npm ci --omit=dev
+# Download dependencies as a separate step to take advantage of Docker's caching.
+# Leverage a cache mount to /root/.npm to speed up subsequent builds.
+# Leverage a bind mounts to package.json and package-lock.json to avoid having to copy them into
+# into this layer.
+RUN --mount=type=bind,source=package.json,target=package.json \
+    --mount=type=bind,source=package-lock.json,target=package-lock.json \
+    --mount=type=cache,target=/root/.npm \
+    npm ci --omit=dev
+
+# Run the application as a non-root user.
+USER root
 
 # Copy the rest of the source files into the image.
 COPY . .
 
-# Run the application as a root user.
-USER root
-
 # Expose the port that the application listens on.
 EXPOSE 8000