[PATCH] ci: drop Travis configuration

[Ferruh Yigit]

On 12/13/2022 3:07 PM, David Marchand wrote:
> We stopped using Travis in the main branch and in the public CI in favor
> of GHA more than a year ago.
> The UNH community lab now covers testing native compilation and unit
> tests for ARM platforms.
> 
> We decided to stop maintaining the configuration in our repository with
> the argument that "if it is not tested, it is broken".
> 
> Signed-off-by: David Marchand <david.marchand at redhat.com>

Acked-by: Ferruh Yigit <ferruh.yigit at amd.com>