This project is meant to ease the developmet for the esp32, containing the development tools all in one docker image, keeping your system clean.
That's the beauty of it, you just need docker.
Ok...
If you want to use the Makefile you'll actually need make.
Plug in your esp32 module to an USB port.
Copy your project to the project folder, and run:
make shell
in this project's top directory. The docker image will be built (if it is not built yet) and you will be presented with a bash running inside the container, from there, you'll just need to build your project.
If you don't have a project, run the make shell command and simply copy one
of the examples from the example folder and start from there:
cp -r ../esp-idf/examples/get-started/hello_world/* ./
for example.
Because of timestamps and the way make stores temporary files outside the build directory, the best way to not rebuild your entire project every time you re-launch your container is to actually use cmake. When you have a shell in the environment:
Configure the project
idf.py menuconfig
Build it
idf.py build
Flash it
idf.py -p /dev/ttyUSB0 flash
This image is based on the instructions described here.