The original `go.yml` got added via some GH automation. But we
are not MSDOS and we can affort more than 3 chars for a file
extension - so this commit renames all .yml to .yaml which is
what we use everywhere else.
This commit adds a smoke test that builds the ibcli container
and runs a fedora-41 raw-minimal build to double check that
the container based building actually works.
Thanks to Ondrej for suggesting this.
This commit adds a basic HACKING.md that explains the bare mimimum
to get started, including `go test -short` to skip the expensive
tests.
Contains also a drive-by rename of the test dependency install
for the GH action.
