add function to source .env files in fish

configs/fish/functions/envsource.fish

@@ -0,0 +1,7 @@
+function envsource
+  for line in (cat $argv | grep -v '^#')
+    set item (string split -m 1 '=' $line)
+    set -gx $item[1] $item[2]
+    echo "Exported key $item[1]"
+  end
+end