The unauthenticated git protocol on port 9418 is no longer supported.

[drewfreyling]

Steps to reproduce:
Run a docker build with the following dockerfile:

FROM kong:2.6.0-alpine
USER root
RUN luarocks install lua-resty-cookie

Error:
Cloning into 'lua-resty-cookie'...
fatal: remote error:
The unauthenticated git protocol on port 9418 is no longer supported.
Please see https://github.blog/2021-09-01-improving-git-protocol-security-github/ for more information.

Error: Failed cloning git repository.

[kongjun01]

I solved.

api7/lua-resty-radixtree#107 (comment)

[drewfreyling]

LuaRocks 3.8 works around the issue. Ideally the rockspec file should be updated as well.