OCaml 5.0.0 compatibility

[kxc-waddlaw]

The current Dockerfile approach requires two Dockerfiles, one for OCaml 4 and one for OCaml 5. (for installing dependencies. See: https://github.com/kxcteam/pubinfra.dockerfiles/pull/17/files)

Therefore, we want to use Docker's "ARG" feature to externally provide OCaml version information and switch installation scripts accordingly. (ref: Understand how ARG and FROM interact and ARG)

example:

$ docker build --build-arg package_install_script_filename=install_ocaml_4_pacakges.sh .
# In this case, we expect that `install_ocaml_4_pacakges.sh` will be called internally.


$ docker build --build-arg package_install_script_filename=install_ocaml_5_pacakges.sh .
# In this case, we expect that `install_ocaml_5_pacakges.sh` will be called internally.

[kxc-wraikny]

Would it be good to start this issue ( #19 ) after #17 is merged and then continue with #13?

[haochenx]

@kxc-wraikny #13 is way more important than #19 so please proceed from #13 first

[haochenx]

@kxc-wraikny
この PR やる時 ↓ PR で追加された GitHub Actions の workflow の validate-ocaml-general ジョブの matrix に ocaml-version = 5.0.0 をいれてほしい

• Add GitHub actions to build and upload #20

[haochenx]

fyi: @kxc-wraikny @kxc-waddlaw
desc にあった build-arg を変更しました