refactor: dockerfile and add clean-up command

Refactored the dockerfile for a better reliability and overall syntax, comment steps and added cleanup command for a weight gain of the docker image
Adapt the docker-compose to the docker hub documentation

Dockerfile

@@ -1,32 +1,41 @@
+# Build image
 FROM node:20-alpine AS BUILD_IMAGE
 
 WORKDIR /app
 
 ARG TARGETPLATFORM
 ENV TARGETPLATFORM=${TARGETPLATFORM:-linux/amd64}
 
-RUN \
-  case "${TARGETPLATFORM}" in \
-  'linux/arm64' | 'linux/arm/v7') \
-  apk update && \
-  apk add --no-cache python3 make g++ gcc libc6-compat bash && \
-  npm install --global node-gyp \
-  ;; \
-  esac
-
-Run npm install --global pnpm
+# Install OS dependencies
+RUN case "${TARGETPLATFORM}" in \
+    'linux/arm64' | 'linux/arm/v7') \
+    apk update \
+ && apk add --no-cache \
+    python3 \
+    make \
+    g++ \
+    gcc \
+    libc6-compat \
+    bash \
+ && npm install --global node-gyp \
+    ;; \
+    esac
+
+# Install npm dependencies
+RUN npm install --global pnpm
 
 COPY package.json pnpm-lock.yaml ./
 RUN CYPRESS_INSTALL_BINARY=0 pnpm install --frozen-lockfile
 
 COPY . ./
 
+# Git commit tag
 ARG COMMIT_TAG
 ENV COMMIT_TAG=${COMMIT_TAG}
 
 RUN pnpm build
 
-# remove development dependencies
+# Remove development dependencies
 RUN pnpm prune --prod --ignore-scripts
 
 RUN rm -rf src server .next/cache
@@ -35,20 +44,26 @@ RUN touch config/DOCKER
 
 RUN echo "{\"commitTag\": \"${COMMIT_TAG}\"}" > committag.json
 
-
-FROM node:20-alpine
+# Runtime image
+FROM node:20-alpine AS RUNTIME_IMAGE
 
 # Metadata for Github Package Registry
 LABEL org.opencontainers.image.source="https://github.com/Fallenbagel/jellyseerr"
+LABEL org.opencontainers.image.title="Jellyseerr"
+LABEL org.opencontainers.image.description="Fork of Overseerr for Jellyfin support"
 
 WORKDIR /app
 
-RUN apk add --no-cache tzdata tini && rm -rf /tmp/*
+# Add other dependencies and clean-up
+RUN apk add --no-cache \
+    tzdata \
+    tini \
+ && apk cache clean \
+ && rm -rf /tmp/* /var/cache/apk/*
 
-# copy from build image
+# Copy from build image
 COPY --from=BUILD_IMAGE /app ./
 
+EXPOSE 5055
 ENTRYPOINT [ "/sbin/tini", "--" ]
 CMD [ "pnpm", "start" ]
-
-EXPOSE 5055

Dockerfile.local

@@ -3,7 +3,7 @@ FROM node:20-alpine
 COPY . /app
 WORKDIR /app
 
-Run npm install --global pnpm
+RUN npm install --global pnpm
 
 RUN pnpm install