Config file without .yaml extension is silently ignored

[abitrolly]

✗ dive --config dive.yaml --source podman fcc
Using config file: dive.yaml
...
✗ mv dive.yaml dive.cfg
✗ dive --config dive.cfg --source podman fcc
Image Source: podman://fcc
...

I did expected dive to care about config file extension. Strange that no error is shown.

[abitrolly]

dive/cmd/root.go

Lines 69 to 70 in 8d8c84c

	filepathToCfg := getCfgFile(cfgFile)
	viper.SetConfigFile(filepathToCfg)

Instead of viper.SetConfigFile, viper.AddConfigPath can be used to detect and load default configs https://github.com/spf13/viper#reading-config-files