shell: add vim, openssh (hermeticity)

Change-Id: I846b5e2d3f93159a149d694a40d21f22d4fccddc
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1323
Reviewed-by: informatic <informatic@hackerspace.pl>
diff --git a/shell.nix b/shell.nix
index c55ee00..2cc18f2 100644
--- a/shell.nix
+++ b/shell.nix
@@ -59,6 +59,8 @@
     curl
     netcat
     nix
+    vim
+    openssh
   ];
   multiPkgs = pkgs: [
     (pkgs.runCommand "protocols" {}