Dockerfile for easier testing with docker

ci/Dockerfile

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+FROM arm32v7/debian:buster-slim
+
+COPY . /code
+WORKDIR /code
+
+RUN groupadd --gid 1000 pi ;\
+  useradd -u 1000 -g 1000 -G sudo -d /home/pi -m -s /bin/bash -p '$1$iV7TOwOe$6ojkJQXyEA9bHd/SqNLNj0' pi ;\
+  chown -R 1000:1000 /code /home/pi ;\
+  chmod +x /code/scripts/installscripts/buster-install-default.sh
+
+RUN apt-get update ;\
+  apt-get -y install curl gnupg sudo ;\
+  echo 'deb http://raspbian.raspberrypi.org/raspbian/ buster main contrib non-free rpi' > /etc/apt/sources.list ;\
+  echo 'deb http://archive.raspberrypi.org/debian/ buster main' > /etc/apt/sources.list.d/raspi.list ;\
+  curl http://raspbian.raspberrypi.org/raspbian.public.key | apt-key add - ;\
+  curl http://archive.raspberrypi.org/debian/raspberrypi.gpg.key | apt-key add - ;\
+  echo 'pi ALL=(ALL) NOPASSWD: ALL' > /etc/sudoers.d/pi ;\
+  apt-get clean ;\
+  rm -rf /var/cache/apt/* /var/lib/apt/lists/*
+
+RUN apt-get update ;\
+  apt-get -y dist-upgrade --auto-remove --purge ;\
+  apt-get -y install python3-pip wget build-essential git iw locales ;\
+  apt-get clean ;\
+  rm -rf /var/cache/apt/* /var/lib/apt/lists/*
+
+USER pi

ci/README.md

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+# Docker Test-Environment
+
+Having to re-flash the sd card of their raspberry pi did annoy ZyanKLee that much he created
+this little set of tools to allow testing without flashing.
+
+This is a work in progress so expect things to fail or being flaky.
+
+## Howto
+
+* First you need a raspberry pi with some decent performance (RPi 3 or 4 would be recommended)
+* Flash its sd card with raspbian buster lite
+* use raspi-config to resize the filesystem to the whole sd card (menu: 7 -> A1)
+* install some tools and reboot:
+      sudo apt-get update
+      sudo apt-get -y dist-upgrade
+      sudo apt-get -y install docker.io git
+      sudo gpasswd -a pi docker
+      sudo reboot
+* login to your RPi
+* clone this repo and cd into its local clone:
+      git clone https://github.com/MiczFlor/RPi-Jukebox-RFID.git
+      cd RPi-Jukebox-RFID/
+* build the docker image:
+      docker build -t rpi-jukebox-rfid:latest -f ci/Dockerfile .
+* get something to drink or eat
+* run the freshly built docker image and start testing. For example:
+      docker run --rm -ti rpi-jukebox-rfid:latest /bin/bash
+      ./scripts/installscripts/buster-install-default.sh
+
+
+    NOTE: Get familiar with docker and its flags - `--rm` for example will remove the
+          container after you log out of it and all changes will be lost.
+
+
+### mount hosts code as volume
+
+The created image now contains all the code in the directory `/code` - if you do not want to
+rebuild the image after each code-change you can 'mount' the RPi's code version into the
+container:
+
+    git clone https://github.com/MiczFlor/RPi-Jukebox-RFID.git
+    cd RPi-Jukebox-RFID/
+    docker build -t rpi-jukebox-rfid:latest -f ci/Dockerfile .
+    docker run --rm -ti -v $PWD:/code rpi-jukebox-rfid:latest /bin/bash
+
+In that way every change to the code in the container will be available on the RPi as well
+as vice versa.