fix: dart off server

Dockerfile

@@ -2,16 +2,14 @@ FROM dart:2.19.1 as builder
 WORKDIR /app
 COPY pubspec.yaml pubspec.lock ./
 RUN dart pub get 
-RUN mkdir -p /dart/bin/dart_off_server
 COPY . .
-RUN dart compile exe bin/cli.dart -o /dart/bin/dart_off_server
+RUN dart compile exe bin/cli.dart -o /app/dart_off_server
 
 # copy server file to basic image to run the app
-FROM alpine:latest
+FROM ubuntu:latest
+WORKDIR /app
 RUN apk add --no-cache bash
-RUN mkdir -p /dart/bin
-COPY --from=builder /dart/bin/dart_off_server /dart/bin/dart_off_server
+COPY --from=builder /app/dart_off_server /app/dart_off_server
 RUN ls -la
-RUN ls /dart/bin
-RUN pwd /dart/bin
-CMD ["/dart/bin/dart_off_server"]
+RUN pwd
+CMD ["/app/dart_off_server"]