add Dockerfile for build environment

Makefile

@@ -1,11 +1,22 @@
 
-.PHONY: firmware case pcb
+.PHONY: firmware flash firmware_docker case pcb
 
 all: firmware case pcb
 
 firmware:
 	+@make -C firmware all
 
+clean:
+	+@make -C firmware clean
+
+firmware_docker:
+	sh -c "docker build -t fiatlux_env docker"
+	sh -c "docker run --volume "$$(pwd)"/firmware:/firmware fiatlux_env make -C firmware all"
+
+clean_docker:
+	sh -c "docker build -t fiatlux_env docker"
+	sh -c "docker run --volume "$$(pwd)"/firmware:/firmware fiatlux_env make -C firmware clean"
+
 flash:
 	+@make -C firmware flash
 

docker/Dockerfile

@@ -0,0 +1,9 @@
+# syntax=docker/dockerfile:1
+FROM debian:sid
+RUN apt update && apt install -y make bash gawk g++ gcc libc6-dev flex bison automake autoconf gperf texinfo wget git bzip2 help2man libtool libtool-bin unrar-free unzip ncurses-dev libexpat-dev python-dev python3
+RUN mkdir modules; git clone --recursive https://github.com/SuperHouse/esp-open-rtos.git modules/rtos; git clone --recursive https://github.com/pfalcon/esp-open-sdk.git modules/sdk
+RUN sed -i 's/GNU bash, version (3\\\.\[1-9\]|4)/GNU bash, version (3.[1-9]|4|5)/g' modules/sdk/crosstool-NG/configure.ac; mkdir -p modules/sdk/crosstool-NG/.build/tarballs; wget https://github.com/libexpat/libexpat/releases/download/R_2_1_0/expat-2.1.0.tar.gz -O modules/sdk/crosstool-NG/.build/tarballs/expat-2.1.0.tar.gz
+RUN cd modules/sdk; export CT_EXPERIMENTAL=y; export CT_ALLOW_BUILD_AS_ROOT=y; export CT_ALLOW_BUILD_AS_ROOT_SURE=y; make standalone=y -j$(nproc); wget -N https://raw.githubusercontent.com/espressif/esptool/master/esptool.py -O xtensa-lx106-elf/bin/esptool.py
+RUN apt remove --purge -y python2 && apt autoremove --purge -y && apt install -y python3 python3-serial perl
+RUN apt install -y --reinstall python-is-python3
+ENV PATH=/modules/sdk/xtensa-lx106-elf/bin:$PATH