Support for building in docker

Makefile

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+.PHONY: docker-image docker-shell
+
+BASE_DIR = $(shell pwd)
+
+all: docker-image docker-shell
+
+docker-image:
+	docker build -t citadel-builder scripts/docker
+
+docker-shell:
+	docker run -it --mount type=bind,source=$(BASE_DIR),target=/home/builder/citadel citadel-builder 
+

scripts/docker/Dockerfile

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+FROM debian:buster
+
+ENV DEBIAN_FRONTEND noninteractive
+
+# Install yocto dependencies, locales, libs for gcc plugin building and a text editor
+RUN apt update && apt install -y gawk \
+    wget \
+    git-core \
+    diffstat \
+    unzip \
+    texinfo \
+    gcc-multilib \
+    build-essential \
+    chrpath \
+    socat \
+    cpio \
+    python \
+    python3 \
+    python3-pip \
+    python3-pexpect \
+    xz-utils \
+    debianutils \
+    iputils-ping \
+    locales \
+    libgmp-dev \
+    libmpc-dev \
+    libelf-dev \
+    nano \
+    inkscape
+
+# python
+RUN echo "en_US.UTF-8 UTF-8" > /etc/locale.gen
+RUN locale-gen
+RUN update-locale LANG=en_US.UTF-8
+ENV LC_ALL en_US.UTF-8
+ENV LC_CTYPE en_US.UTF-8
+
+RUN useradd -ms /bin/bash builder
+
+USER builder
+RUN echo ". /home/builder/citadel/setup-build-env" >> /home/builder/.bashrc
+CMD ["bash"]
+
+WORKDIR /home/builder/citadel/
+
+# No command is run at this point