feat(build): supports cleanup of rpm/deb residual files after uninstall

[tzssangglass]

Summary

when installing Kong via rpm/deb and then removing it, there may be residual files and directories left in the system from the installation. The current commit supports cleaning up these leftover files through postremove.

For reviewers:

current situation: after removing Kong, some installation files of Kong will remain:

• /var/spool/mail/kong
• /etc/kong
• /home/kong
• /usr/local/share/lua/5.1/
• /usr/local/lib/luarocks/
• /usr/local/lib/lua
• /usr/local/openresty/
• /usr/local/kong/include
• /usr/local/kong/lib

because these files in the folder are not tracked by the package manager.

after this PR modification, the following folders will be tracked by the package manager. If Kong is removed, the files imported during the installation of Kong from these folders will also be deleted. Unrelated files to Kong will not be deleted, it is safe:

• /usr/local/share/lua/5.1/
• /usr/local/lib/luarocks/
• /usr/local/lib/lua
• /usr/local/openresty/
• /usr/local/kong/include
• /usr/local/kong/lib

after removing nginx, some files have been retained because:

• the Nginx user still exists, so I choose to keep Kong user and /home/kong
• nginx will also not remove the /etc/nginx directory, so we do not need to delete /etc/kong

Local manual verification

rhel

bazel build --verbose_failures --config release :kong_el7 

docker run --rm -v ${kong source}/bazel-bin/pkg/kong.el7.amd64.rpm:/kong.el7.amd64.rpm -v  ${kong source}/build/:/build --name kong  -it centos:centos7 /bin/bash

# in docker 

yum install -y kong.el7.amd64.rpm

# in terminal
export BUILD_LABEL="rhel" &&  build/tests/04-uninstall.sh

ubuntu

bazel build --verbose_failures --config release :kong_deb

docker run --rm -v ${kong source}/bazel-bin/pkg/kong.amd64.deb:/kong.amd64.deb -v ${kong source}/build/:/build --name kong -it ubuntu:22.04 /bin/bash

# in docker 
apt-get update
apt install -y ./kong.amd64.deb

# in terminal
export BUILD_LABEL="ubuntu" &&  build/tests/04-uninstall.sh

Checklist

• The Pull Request has tests
• A changelog file has been created under changelog/unreleased/kong or skip-changelog label added on PR if changelog is unnecessary. README.md
• There is a user-facing docs PR against https://github.com/Kong/docs.konghq.com - PUT DOCS PR HERE

Issue reference

Fix FTI-5553