feat: set up fish-foreign-env on home declaration

modules/radix/files/fish.scm

@@ -1,6 +1,8 @@
 (define-module (radix files fish)
   #:use-module (gnu)
+  #:use-module (gnu packages shells)
   #:export (abbreviations
+            fenv
             greeting
             prompt
             variables))
@@ -16,3 +18,7 @@
 
 (define variables
   (local-file "../../../files/fish/variables.fish"))
+
+(define fenv
+  (file-append fish-foreign-env
+               "/share/fish/functions/fenv.fish"))

radio.scm

@@ -219,7 +219,8 @@
         #|Shell services|#
         (service home-fish-service-type
                  (home-fish-configuration
-                  (config (list file:fish-abbreviations))
+                  (config (list file:fish-fenv
+                                file:fish-abbreviations))
                   (aliases
                    `(#|Common aliases|#
                      ("df"   . "df -h")