Define a CI build that will test the build process with system nim
compiler on the master branch.
Referenced issue: https://github.com/codex-storage/nim-codex/issues/940
Signed-off-by: markoburcul <marko@status.im>
Initialized flake file and added development shell definition.
Exporting of default compiler flags is moved to makefile.
Referenced issue: https://github.com/codex-storage/nim-codex/issues/940
Signed-off-by: markoburcul <marko@status.im>