meson: install shell files

Change-Id: I7c30690e5763d095cf7444333f7b687509051c5f

scripts/meson.build

@@ -1,3 +1,5 @@
+# configures `scripts/nix-profile.sh.in` (and copies the original to the build directory).
+# this is only needed for tests, but running it unconditionally does not hurt enough to care.
 configure_file(
   input : 'nix-profile.sh.in',
   output : 'nix-profile.sh',
@@ -12,3 +14,16 @@ configure_file(
   output : 'nix-profile.sh.in',
   copy : true,
 )
+
+foreach rc : [ '.sh', '.fish', '-daemon.sh', '-daemon.fish' ]
+  configure_file(
+    input : 'nix-profile' + rc  + '.in',
+    output : 'nix' + rc,
+    install : true,
+    install_dir : sysconfdir / 'profile.d',
+    install_mode : 'rw-r--r--',
+    configuration : {
+      'localstatedir': state_dir,
+    },
+  )
+endforeach