feat(ops/glesys): Provide tf-glesys wrapper

This provides the right Terraform provider with a wrapper in $PATH.

Change-Id: Idcb4fa89dff0161e8a73addfce81959e825c331e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/4562
Tested-by: BuildkiteCI
Autosubmit: tazjin <mail@tazj.in>
Reviewed-by: grfn <grfn@gws.fyi>

ops/glesys/default.nix

@@ -0,0 +1,8 @@
+{ depot, pkgs, ... }:
+
+depot.nix.readTree.drvTargets {
+  # Provide a Terraform wrapper with the right provider installed.
+  terraform = pkgs.terraform.withPlugins(_: [
+    depot.third_party.terraform-provider-glesys
+  ]);
+}