Added docker build support

.dockerignore

@@ -0,0 +1,2 @@
+buildroot/output
+buildroot/dl

Dockerfile

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+FROM stpos-multiboot
+#ubuntu:20.04
+LABEL authors="Tobias Madlberger"
+
+RUN apt-get update
+RUN apt install -y software-properties-common
+RUN add-apt-repository -y ppa:rock-core/qt4
+RUN apt-get update && apt-get install -y \
+    build-essential  \
+    rsync  \
+    texinfo  \
+    libncurses-dev  \
+    whois  \
+    unzip  \
+    bc  \
+    gcc=4:9.3.0-1ubuntu2 \
+    qt4-linguist-tools \
+    libssl-dev \
+    git \
+    wget \
+    cpio \
+    python2
+
+RUN if [[ ! -f /usr/bin/python ]] ; then n -s /usr/bin/python2 /usr/bin/python ; else echo Python already linked ; fi
+
+RUN wget https://www.libarchive.org/downloads/libarchive-3.3.1.tar.gz
+RUN tar xzf libarchive-3.3.1.tar.gz
+WORKDIR libarchive-3.3.1
+RUN ./configure
+RUN make
+RUN make install
+
+WORKDIR /home/dev/StpOs-Multiboot
+
+CMD ["./build.sh"]

README_PINN.md

@@ -1233,6 +1233,20 @@ to lower the number to prevent swapping:
 
 If your build machine also has some QT5 components, it is useful to `export QT_SELECT=4` before building to ensure the QT4 component versions are selected.
 
+## Build using docker
+
+When using docker, all required packages will get installed automatically when running, making sure the container is able to build PINN.
+When you run the container first time, it'll download all packages and (maybe) ubuntu20.04. Once that's done, it's recommended to create an image from this container,
+so you don't have to download it over and over again. Use `docker commit <container-id> pinn-build-image`. Then you have to change all references to ubuntu:20.04
+  with pinn-build-image in the Dockerfile and docker-compose.yml
+
+Starting the build on linux:
+`sudo docker-compose up`
+
+This will execute all the builds and output the binary file into the buildroot/output folder, just like when you execute the BUIDME.sh directly.
+
+The output folder will be created during runtime.
+
 ## How to run your Build
 
 In order to set up an SD card with a newly built version of PINN, you will need to:

docker-compose.yml

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+version: "3"
+
+services:
+  build-stp-os-multiboot:
+    image: ubuntu:20.04
+    build: .
+    volumes:
+      - path/to/local/pinn/repo:/home/dev/PINN