nix-profile.fish: Look for ca-bundle.crt in $NIX_PROFILES

There seems to be no good reason for `nix-profile.fish` and
`nix-profile-daemon.fish` to differ in how they look for the location of
the `ca-bundle.crt` that might be installed by one of the packages.

As `$NIX_PROFILES` points to user local paths, not checking there is
strictly less useful, it seems?

Author: ilya-bobyr

scripts/nix-profile.fish.in

@@ -53,6 +53,13 @@ else if test -e "$NIX_LINK/etc/ssl/certs/ca-bundle.crt" # fall back to cacert in
     set --export NIX_SSL_CERT_FILE "$NIX_LINK/etc/ssl/certs/ca-bundle.crt"
 else if test -e "$NIX_LINK/etc/ca-bundle.crt" # old cacert in Nix profile
     set --export NIX_SSL_CERT_FILE "$NIX_LINK/etc/ca-bundle.crt"
+else
+    # Fall back to what is in the nix profiles, favouring whatever is defined last.
+    for i in (string split ' ' $NIX_PROFILES)
+        if test -e "$i/etc/ssl/certs/ca-bundle.crt"
+            set --export NIX_SSL_CERT_FILE "$i/etc/ssl/certs/ca-bundle.crt"
+        end
+    end
 end
 
 # Only use MANPATH if it is already set. In general `man` will just simply