Add configurable container runtime variable to Makefile

[leighmcculloch]

What

Introduce a CONTAINER_RUNTIME variable that defaults to docker but can be overridden to use alternative runtimes like podman. Replace hardcoded docker commands in run, logs, console, and build targets with this variable.

Why

Allow users with different container runtimes to use the Makefile without modification.

[Copilot]

Pull request overview

This PR adds flexibility to the Makefile by introducing a configurable container runtime variable, allowing users to use alternative container runtimes like Podman without modifying the Makefile.

Changes:

• Added CONTAINER_RUNTIME variable with conditional assignment defaulting to docker
• Replaced all hardcoded docker commands in the Makefile with the $(CONTAINER_RUNTIME) variable

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[fnando]

This looks good! There are 2 actions failing, related to friendbot timing out, but that's also happening on main (curiously, both failures happen on arm64) Re-running failed jobs made them pass!