dockerfile fix

Dockerfile

@@ -1,78 +1,47 @@
-# syntax=docker/dockerfile:1.6
+# Environemnt to install flutter and build web
+FROM debian:latest AS build-env
 
-###############################################
-# Build stage: compile Flutter web artifacts. #
-###############################################
-FROM ubuntu:22.04 AS build
+# install all needed stuff
+RUN apt-get update
+RUN apt-get install -y curl git unzip
 
-ENV DEBIAN_FRONTEND=noninteractive \
-    FLUTTER_CHANNEL=stable \
-    FLUTTER_VERSION=3.24.3 \
-    FLUTTER_HOME=/opt/flutter
+# define variables
+ARG FLUTTER_SDK=/usr/local/flutter
+ARG FLUTTER_VERSION=3.31.0
+ARG APP=/app/
 
-RUN apt-get update && \
-    apt-get install -y --no-install-recommends \
-        ca-certificates \
-        curl \
-        git \
-        unzip \
-        xz-utils \
-        zip \
-        libglu1-mesa && \
-    rm -rf /var/lib/apt/lists/*
+#clone flutter
+RUN git clone https://github.com/flutter/flutter.git $FLUTTER_SDK
+# change dir to current flutter folder and make a checkout to the specific version
+RUN cd $FLUTTER_SDK && git fetch && git checkout $FLUTTER_VERSION
 
-RUN curl -fsSL "https://storage.googleapis.com/flutter_infra_release/releases/${FLUTTER_CHANNEL}/linux/flutter_linux_${FLUTTER_VERSION}-${FLUTTER_CHANNEL}.tar.xz" \
-    | tar -xJ -C /opt && \
-    ln -s ${FLUTTER_HOME} /usr/local/flutter
+# setup the flutter path as an enviromental variable
+ENV PATH="$FLUTTER_SDK/bin:$FLUTTER_SDK/bin/cache/dart-sdk/bin:${PATH}"
 
-ENV PATH="${FLUTTER_HOME}/bin:${FLUTTER_HOME}/bin/cache/dart-sdk/bin:${PATH}"
+# Start to run Flutter commands
+# doctor to see if all was installes ok
+RUN flutter doctor -v
 
-# Create a non-root user for Flutter
-RUN useradd -m -s /bin/bash flutter && \
-    chown -R flutter:flutter ${FLUTTER_HOME}
+# create folder to copy source code
+RUN mkdir $APP
+# copy source code to folder
+COPY . $APP
+# stup new folder as the working directory
+WORKDIR $APP
 
-# Switch to non-root user for Flutter commands
-USER flutter
-
-RUN flutter config --enable-web && \
-    flutter doctor -v
-
-WORKDIR /app
-
-COPY --chown=flutter:flutter pubspec.yaml pubspec.lock ./
+# Run build: 1 - clean, 2 - pub get, 3 - build web
+RUN flutter clean
 RUN flutter pub get
+RUN flutter build web
 
-COPY --chown=flutter:flutter . .
-RUN flutter build web --release
+# once heare the app will be compiled and ready to deploy
 
-##########################################
-# Runtime stage: serve assets via nginx. #
-##########################################
-FROM ubuntu:22.04 AS runner
+# use nginx to deploy
+FROM nginx:1.25.2-alpine
 
-ENV DEBIAN_FRONTEND=noninteractive
-
-RUN apt-get update && \
-    apt-get install -y --no-install-recommends nginx && \
-    rm -rf /var/lib/apt/lists/*
-
-# Remove default site definition to avoid duplicate configs.
-RUN rm -f /etc/nginx/sites-enabled/default
-
-# Provide a minimal nginx site config for the Flutter web assets.
-RUN printf 'server {\n\
-    listen 80 default_server;\n\
-    listen [::]:80 default_server;\n\
-    root /var/www/html;\n\
-    index index.html;\n\
-    location / {\n\
-        try_files $uri $uri/ /index.html;\n\
-    }\n\
-}\n' > /etc/nginx/conf.d/flutter.conf
-
-COPY --from=build /app/build/web /var/www/html
+# copy the info of the builded web app to nginx
+COPY --from=build-env /app/build/web /usr/share/nginx/html
 
+# Expose and run nginx
 EXPOSE 80
-
 CMD ["nginx", "-g", "daemon off;"]
-