internal/rosa/package: migrate python interpreter

Packages will take quite some work.

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

internal/rosa/state.go

@@ -424,6 +424,8 @@ func (s *S) getFrame() azalea.Frame {
 		)
 
 		s.frame.Val = map[unique.Handle[azalea.Ident]]any{
+			k("linuxArch"): s.linuxArch(),
+
 			k("jobsE"):      jobsE,
 			k("jobsFlagE"):  jobsFlagE,
 			k("jobsLE"):     jobsLE,
@@ -431,6 +433,24 @@ func (s *S) getFrame() azalea.Frame {
 		}
 		s.frame.Func = map[unique.Handle[azalea.Ident]]azalea.F{
 
+			// library functions
+
+			k("join"): {F: func(
+				args azalea.FArgs,
+			) (v any, set bool, err error) {
+				var elems []string
+				var sep string
+				if err = args.Apply(map[unique.Handle[azalea.Ident]]any{
+					k("elems"): &elems,
+					k("sep"):   &sep,
+				}); err != nil {
+					return
+				}
+				v = strings.Join(elems, sep)
+				set = true
+				return
+			}},
+
 			// intenral/pkg built-ins
 
 			k("remoteTar"): {F: func(