fix dockerfile

Author: lydiagarms

Dockerfile

@@ -1,34 +1,29 @@
 # build zokrates from source for local verify
 FROM rust:1.53.0 as builder
-
 WORKDIR /app
 COPY . .
 RUN git clone --depth 1 --branch 0.8.8 https://github.com/Zokrates/ZoKrates /app/zoKratesv0.8.8
 WORKDIR /app/zoKratesv0.8.8
 RUN rustup install nightly-2022-06-28
 RUN cargo +nightly-2022-06-28 build -p zokrates_cli --release
-
 # Copy the built result into /app/zoKrates
 RUN cp -r /app/zoKratesv0.8.8 /app/zoKrates
 
-
 FROM ubuntu:24.10
-
 ENV USERNAME="app"
-
 WORKDIR /app
-
 # Install NodeJs
 RUN apt-get update && \
     apt-get install -y netcat-traditional curl && \
     curl -fsSL https://deb.nodesource.com/setup_20.x | bash - && \
-    apt-get install -y nodejs gcc g++ make 
-
+    apt-get install -y nodejs gcc g++ make && \
+    mkdir /npm-cache
+# Setup environment variables
 ENV npm_config_cache=/npm-cache
 ENV ZOKRATES_HOME /app
 ENV ZOKRATES_STDLIBv8 /app/stdlibv8
 ENV ZOKRATES_STDLIB /app/stdlib
-
+# Copy app files
 COPY config/default.js config/default.js
 COPY package.json package-lock.json ./
 COPY --from=builder /app/zoKratesv0.8.8/zokrates_stdlib/stdlib /app/stdlibv8
@@ -38,16 +33,13 @@ COPY --from=builder /app/zoKrates/target/release/zokrates /app/zokrates
 COPY src ./src
 COPY start-script ./start-script
 COPY start-dev ./start-dev
-
+# Install npm packages as root
 RUN npm i
-
-USER $USERNAME:$USERNAME
-
-# Install NodeJs
+# Change/Add permission to user $USERNAME
 RUN groupadd --gid 10001 $USERNAME && \
     useradd --gid 10001 --uid 10001 --home /app --shell /bin/bash $USERNAME && \
-    mkdir /npm-cache && \
     chown -R $USERNAME:$USERNAME /app /npm-cache
-
+# Switch to user $USERNAME from root
+USER $USERNAME:$USERNAME
 EXPOSE 80
 CMD npm start