Add a Dockerfile for easy building from macOS

[kit-ty-kate]

Currently the installer doesn’t build from macOS anymore, so here is a dockerfile to easily give this option

[andy9a9]

Do you have some kind of error, why is not possible to build it from OSX?

[kit-ty-kate]

$ ./build.sh
Updating submodules...
Downloading installer components...
--2022-03-01 19:00:37--  https://www.python.org/ftp/python/3.9.6/python-3.9.6-macos11.pkg
Resolving www.python.org (www.python.org)... 2a04:4e42:f::223, 151.101.60.223
Connecting to www.python.org (www.python.org)|2a04:4e42:f::223|:443... connected.
HTTP request sent, awaiting response... 416 Range Not Satisfiable

    The file is already fully retrieved; nothing to do.

Building m1n1...
INFO: Building on Darwin
INFO: Toolchain path: /opt/homebrew/opt/llvm/bin/
Building u-boot...
Makefile:40: *** missing separator.  Stop.

(on top of other more minor issues and hard to deal with dependencies, e.g. 7zip)

[andy9a9]

I see the problem... CROSS_COMPILE=aarch64-linux-gnu- and u-boot has undefine MK_ARCH which is trying to undefine the non-existing aarch64-linux-gnu variable. So I'm not sure, how far is it for native compilation.

[samip5]

The takeaway here should be related to:

Makefile:40: *** missing separator.  Stop.

Which suggets an out-of-date make.

@kit-ty-kate Please provide your make version on MacOS.

[kit-ty-kate]

@kit-ty-kate Please provide your make version on MacOS.

macOS provides GNU Make 3.81 (https://github.com/apple-oss-distributions/gnumake), but if it was just that it would be fine. The other dependencies are more annoying to get from what i remember (although this PR is really old at this point so feel free to close it if you don't think it's relevant anymore)