terraform-providers.libvirt: fix plugin output (#48577)

Terraform depends on this binary name format to detect the provider
version.

(cherry picked from commit 7786575)

pkgs/applications/networking/cluster/terraform-providers/libvirt/default.nix

@@ -3,7 +3,7 @@
 # USAGE:
 # install the following package globally or in nix-shell:
 #
-#   (terraform.withPlugins (old: [terraform-provider-libvirt]))
+#   (terraform.withPlugins (p: [p.libvirt]))
 #
 # configuration.nix:
 #
@@ -36,6 +36,10 @@ buildGoPackage rec {
   # and wrapped to terraform via deecb4c1aab780047d79978c636eeb879dd68630
   propagatedBuildInputs = [ cdrtools ];
 
+  # Terraform allow checking the provider versions, but this breaks
+  # if the versions are not provided via file paths.
+  postBuild = "mv go/bin/terraform-provider-libvirt{,_v${version}}";
+
   meta = with stdenv.lib; {
     homepage = https://github.com/dmacvicar/terraform-provider-libvirt;
     description = "Terraform provider for libvirt";