feat: pytorch 2.6.0, version pinning

[DeJayDev]

By user request, I've added a PyTorch 2.6.0 image.

This PR also adds version pinning to torch dependencies for all PyTorch containers. Previously, these containers weren't actually the version on their names, rather whatever the latest torch was at the time of build/release.

Closes #84, didn't recognize this was already open. I'll update my branch to include credit to the author.

[DeJayDev]

I experimented with some changes to the base-template build pipeline before deciding it's too complicated and too far out of scope. The failed checks (the base image build and release job) are unrelated as long as pytorch 2.6 will release.

[ymzlygw]

I experimented with some changes to the base-template build pipeline before deciding it's too complicated and too far out of scope. The failed checks (the base image build and release job) are unrelated as long as pytorch 2.6 will release.

When I can use it in runpod?

[Karllas]

When will this be merged?