diff --git a/Dockerfile b/Dockerfile
index 60b7f5b..a327092 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,11 +1,12 @@
 FROM docker.io/debian:12-slim as build
+ENV DEBIAN_FRONTEND=noninteractive
 RUN apt-get update \
     && apt-get install -y --no-install-recommends \
         sdkmanager \
         xz-utils \
     && rm -rf /var/lib/apt/lists/*
 ADD https://storage.googleapis.com/flutter_infra_release/releases/stable/linux/flutter_linux_3.24.4-stable.tar.xz /flutter.tar.xz
-RUN tar -C /opt/ --exclude=cache -xJf /flutter.tar.xz
+RUN tar -C /opt/ -xJf /flutter.tar.xz
 RUN sdkmanager \
         "build-tools;35.0.0" \
         "cmdline-tools;9.0" \
@@ -13,7 +14,8 @@ RUN sdkmanager \
         "platforms;android-35"
 
 FROM docker.io/debian:12-slim
-RUN useradd -m app
+ENV DEBIAN_FRONTEND=noninteractive
+RUN touch /.dockerenv
 RUN apt-get update \
     && apt-get install -y --no-install-recommends \
         curl \
@@ -21,8 +23,7 @@ RUN apt-get update \
         openjdk-17-jdk-headless \
         unzip \
     && rm -rf /var/lib/apt/lists/*
-COPY --from=build --chown=app:app /opt/ /opt/
-USER app
+COPY --from=build --chown=0:0 /opt/ /opt/
 ENV PATH="/opt/flutter/bin:$PATH"
 RUN flutter config --android-sdk /opt/android-sdk/ \
     && yes | flutter doctor --android-licenses > /dev/null