make the nix packages use the build tags properly.

Author: numkem

nix/pkgs/cli.nix

@@ -34,6 +34,8 @@ buildGoModule {
     "main.version=${version}"
   ];
 
+  tags = [ ] ++ (lib.optional withWasm [ "wasmtime" ]) ++ (lib.optional withPodman [ "podman" ]);
+
   postInstall = ''
     mv $out/bin/cli $out/bin/msgscriptcli
   '';

nix/pkgs/server.nix

@@ -19,7 +19,7 @@ buildGoModule {
 
   subPackages = [ "cmd/server" ];
 
-  nativeBuildInputs = [ pkg-config ];
+  nativeBuildInputs = [ ] ++ (lib.optional withPodman [ pkg-config ]);
 
   buildInputs =
     [ ]
@@ -34,6 +34,8 @@ buildGoModule {
     "main.version=${version}"
   ];
 
+  tags = [ ] ++ (lib.optional withWasm [ "wasmtime" ]) ++ (lib.optional withPodman [ "podman" ]);
+
   doCheck = false; # Requires networking, will just timeout
 
   postInstall = ''