apt: pdm uses separator for test repo

For consistency with it's other repositories, we might migrate other
products also to this schema with a future major release (and nginx
rewrite config for backward compatibility)

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

proxmox-apt/src/repositories/standard.rs

@@ -160,7 +160,10 @@ impl APTRepositoryHandleImpl for APTRepositoryHandle {
                     ],
                     _ => vec![format!("http://download.proxmox.com/debian/{}", product)],
                 },
-                format!("{}test", product),
+                match product {
+                    "pdm" => format!("{}-test", product),
+                    _ => format!("{}test", product),
+                },
             ),
             APTRepositoryHandle::CephQuincyEnterprise => (
                 APTRepositoryPackageType::Deb,