fix: extension base folder permission

The `modules.dep` kernel module dependency tree extension root path was
previously created with a permission of `0o700` which means the talos
root go a permission of `0o700` when the kernel module tree was re-built
when extensions providing kernel modules was enabled. This means that
any binaries lost the executable permission when ran as non-root
creating an `EACCES` error. Fix by making sure the temporary directory
created for building kernel modules tree has `0o755` permission
explicitly.

Signed-off-by: Noel Georgi <git@frezbo.dev>

internal/pkg/extensions/kernel_modules.go

@@ -144,6 +144,11 @@ func GenerateKernelModuleDependencyTreeExtension(extensionsPathWithKernelModules
 		return nil, err
 	}
 
+	// we want to make sure the root directory has the right permissions.
+	if err := os.Chmod(kernelModulesDependencyTreeStagingDir, 0o755); err != nil {
+		return nil, err
+	}
+
 	kernelModulesDepenencyTreeDirectory := filepath.Join(kernelModulesDependencyTreeStagingDir, constants.DefaultKernelModulesPath)
 
 	if err := os.MkdirAll(kernelModulesDepenencyTreeDirectory, 0o755); err != nil {