make the packages role more generic

tasks/RedHat/nushell.yml

@@ -0,0 +1,16 @@
+---
+- name: install RedHat dependencies
+  set_fact:
+    nushell_pkgdeps:
+      - cargo
+      - libxcb
+      - openssl-devel
+      - libX11-devel
+    nushell_altdeps:
+      - packages/Linux/nushell.yml
+      - packages/{{ ansible_os_family }}/carapace.yml
+
+- name: append to pkgs
+  set_fact:
+    syspkgs: "{{ (syspkgs | default([])) + nushell_pkgdeps }}"
+    altpkgs: "{{ (altpkgs | default([])) + nushell_altdeps }}"