mdbook-cmdrun: skip tests that require hardcoded binary paths

Skip two tests that fail in the Nix sandbox because they attempt to
invoke the built binary from a hardcoded relative path
(../../target/debug/mdbook-cmdrun) which doesn't exist in the Nix
build environment where the binary is at target/release/mdbook-cmdrun.

The tests build_test_book and build_test_book_with_dynamic_src are
integration tests that test mdbook's interaction with the preprocessor,
but they make assumptions about the build directory structure that don't
hold in Nix.

Author: roberth

pkgs/by-name/md/mdbook-cmdrun/package.nix

@@ -28,6 +28,13 @@ rustPlatform.buildRustPackage {
 
   cargoHash = "sha256-C3Rg+WXHBA7KyUDFdhBz4mOm8CFH/f7UVA8KOLs9ClE=";
 
+  checkFlags = [
+    # Tests try to invoke binary from hardcoded relative path (../../target/debug/mdbook-cmdrun)
+    # which doesn't work in Nix sandbox
+    "--skip=build_test_book"
+    "--skip=build_test_book_with_dynamic_src"
+  ];
+
   meta = {
     description = "mdbook preprocessor to run arbitrary commands";
     mainProgram = "mdbook-cmdrun";