how to run an app with flutter-pi from a docker container - flutter

Question

I'm running a flutter app on a raspberry pi 4, I'm using flutter-pi. Everything works fine, but I want to take it to a higher level.
I want to encapsulate the app and all flutter-pi dependencies in a docker container.
I am using the ubuntu:jammy image as a base, I have installed all the dependencies according to flutter-pi.
When I run the app I get this error:
[locales] Warning: The system has no configured locale. The default "C" locale may or may not be supported by the app.
[keyboard] Could not load keyboard configuration from "/etc/default/keyboard". Default keyboard config will be used. load_file: No such file or directory
[flutter-pi] Could not query DRM device list: No such file or directory
NOTE: the raspberry is configured to do a console auto login and does not have a graphical interface

Answer 1

I have developed a flutter-pi application and encapsulated it in a container.
What I noticed is that this error (Could not query DRM device list: No such file or directory) happens to me only sometimes, the configuration is always the same but sometimes I faced it and some times I didn't.
I'm assuming it is related with the host system in which the docker containers are running, because as I previously said the configuration of the container is always the same in both the working container and the not working one.
I'm attaching down below the configuration of my dockerfile (it's made of 2 dockerfiles but it's only 1 container that I'm running, the second dockerfile uses the first one which is built in emotionsrl/tower-display-base).
The display_launcher.py only runs the flutter (flutter-pi --release ./spotlink_build) after a few checks that are not related with the rest.
FROM ubuntu
RUN apt -y update \
&& apt -y install git \
&& apt -y install wget \
&& apt -y install build-essential
WORKDIR /TOWER_DISPLAY
# STEP 1 DIPENDENZE
RUN git clone --depth 1 \
https://github.com/ardera/flutter-engine-binaries-for-arm.git \
engine-binaries && cd engine-binaries && ./install.sh
# STEP 2 DIPENDENZE
ENV TZ=Europe/Rome
RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
RUN apt -y install cmake \
libgl1-mesa-dev \
libgles2-mesa-dev \
libegl1-mesa-dev \
libdrm-dev \
libgbm-dev
RUN DEBIAN_FRONTEND='noninteractive' apt -y install ttf-mscorefonts-installer
RUN apt -y install fontconfig \
libsystemd-dev \
libinput-dev \
libudev-dev \
libxkbcommon-dev
#STEP 3 DIPENDENZE
RUN fc-cache
###########################
# COMPILING
RUN git clone https://github.com/ardera/flutter-pi
WORKDIR /TOWER_DISPLAY/flutter-pi/build
RUN cmake ..
RUN make -j `nproc`
RUN make install
FROM emotionsrl/tower-display-base
WORKDIR /TOWER_DISPLAY
COPY spotlink_build ./spotlink_build
COPY display_launcher.py ./display_launcher.py
CMD python3 ./display_launcher.py