Allow execpath to refer to a directory

[allsey87]

Description of the feature request:

In Bazel 7, referring to directories in execroot gives this warning:

WARNING: /workspaces/builder-bazel/testing/BUILD:131:6: input 'resource_dir' of //testing:my_test is a directory; dependency checking of directories is unsound

However, there are no good alternative for solving this problem:

cc_binary(
   ...
   env = {
       "RESOURCES": "$(execpath @resources//:resource_dir)"
   }
   ...
)

Which category does this issue belong to?

Rules API, Starlark Integration

What underlying problem are you trying to solve with this feature?

I need to set an environment variable of a binary inside of Bazel to a directory.

Which operating system are you running Bazel on?

Linux

What is the output of bazel info release?

release 7.2.1

If bazel info release returns development version or (@non-git), tell us how you built Bazel.

No response

What's the output of git remote get-url origin; git rev-parse HEAD ?

No response

Have you found anything relevant by searching the web?

I have looked at different approaches to solving this program (macros, rules, providers), all of which seem very verbose and do not solve the problem

Any other information, logs, or outputs that you want to share?

No response