Nix flake build static with sqlite support

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with nix develop -c $SHELL you can enter the dev environment.
now with make clean-all generate build -j1 you will get a static linked binary that has sqlite support

example:

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Before, we can build (cross-compile) Gitea without CGO

@wxiaoguang now it should not break anything :)

You could probably put this env var in the nix flake though.

done ...

I suggest something like GO_BUILD_VARS ?= in the Makefile ...

well the makefile could be reworked to use less specific env vars and build things up to be collected in one var ... but I think this is some refactor to be done in another pull dedicated to it ... if one wants to

Same question, why CGO_ENABLED is needed, why -extldflags -static is needed

because if you dont build static in nixos the gitea binary just panics:

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@techknowlogick pam needs cgo too - added :)

and it does not support static linking ...

[techknowlogick]

I think we could combine the if conditions to something like:

ifneq ($(and $(STATIC),$(findstring pam,$(TAGS))),)
  $(error pam support set via TAGS doesn't support static builds)
endif

I just cobbled this together in the web review page, so please run it before accepting that it works.

[techknowlogick]

what about on windows, as I think we need different extldflags for windows? or are we assuming that STATIC variable will only be used in nix flake?