Add podman build workflow for working with older glibc

[AlEscher]

I am using Ubuntu 20.04.3 LTS.

Steps to reproduce

• Download the godotpcktool binary for Linux
• chmod +x
• ./godotpcktool -h
• The following error messages appear:

./godotpcktool: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.33' not found (required by ./godotpcktool)
./godotpcktool: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.32' not found (required by ./godotpcktool)

This only happens with the release binaries of 1.5 and 1.6. The 1.4 binaries work as expected.

[hhyyrylainen]

I've compiled the newer releases with Fedora 34 meaning that any distro with an older glibc won't be able to run it. I guess the most obvious way to fix this would be to have a podman build workflow that uses the oldest ubuntu LTS still supported (and one that can compile the source code) and performs the Linux compile in the container to make a build that works with older glibc.

[AlEscher]

I guess so. I resorted to building the source code which resulted in a working executable aswell.

[hhyyrylainen]

Well the required glibc version is purely determined by the platform you build the code on. Meaning that if you compile the code on your system, it has no choice but to use the correct glibc version for your system.

[hhyyrylainen]

I got around to doing this now. @AlEscher before I release 1.7 with the new builds, could you test the attached executable I built with Ubuntu 20.04 docker image (or you can alternatively do the podman build yourself to test it)? godotpcktool.zip

[AlEscher]

The attached binary works for me

[hhyyrylainen]

Good to get that confirmed. I published 1.7 as the release that now has that as the prebuilt binary (and change to having link time optimization on). https://github.com/hhyyrylainen/GodotPckTool/releases/tag/v1.7