hst/grp_pwd: specify new uid format

This leaves slots available for additional uid ranges in Rosa OS.

This breaks all existing installations! Users are required to fix ownership manually.

Closes #18.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/outcome/shim_test.go

@@ -123,7 +123,7 @@ func TestShimEntrypoint(t *testing.T) {
 	templateState := outcomeState{
 		Shim:      newShimParams(),
 		ID:        &checkExpectInstanceId,
-		Identity:  hst.IdentityMax,
+		Identity:  hst.IdentityEnd,
 		UserID:    10,
 		Container: hst.Template().Container,
 		Mapuid:    1000,