CreateImageWizard: initialize on-prem with host distro

Initialize the create image wizard with the host's distribution for the
on-premise frontend.

src/Components/CreateImageWizard/utilities/getHostInfo.ts

@@ -0,0 +1,8 @@
+import { read_os_release } from 'os-release';
+
+import { Distributions } from '../../../store/imageBuilderApi';
+
+export const getHostDistro = async () => {
+  const osRel = await read_os_release();
+  return `${osRel.ID}-${osRel.VERSION_ID}` as Distributions;
+};