[rocm-libraries] ROCm/rocm-libraries#4430 (commit 3bcf68c)

[CK] Add project root marker for monorepo compatibility
 (#4430)

## Summary
- Add `.ck-project-root` marker file at the composablekernel project
root
- Update `find_project_root()` in `script/tools/common.sh` to look for
this marker instead of `.git`
- Fixes project root detection when CK is part of the rocm-libraries
monorepo

  ## Background
Since the project was moved into the monorepo, the `.git` directory is
at the monorepo root rather
than the CK project root. This caused `find_project_root()` to return
the wrong path, breaking tools
   in `script/tools/`.

  ## Test plan
- [x] Verify `find_project_root` returns correct path from any CK
subdirectory
  - [x] Verify `ck-build --help` works
  - [x] Verify `ck-configure --help` works

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: Thomas Ning <Thomas.Ning@amd.com>

.ck-project-root

@@ -0,0 +1,2 @@
+# Composable Kernel project root marker
+# Used by scripts in script/tools/ to locate the project root

script/tools/common.sh

@@ -5,7 +5,7 @@
 # Common utilities for CK Docker tools
 # Shared configuration and helper functions
 
-# Find project root (where .git directory is)
+# Find project root using relative path (fallback)
 get_project_root() {
     local script_dir="$1"
     cd "${script_dir}/../.." && pwd
@@ -149,11 +149,11 @@ is_build_configured() {
     [ -f "${build_dir}/build.ninja" ]
 }
 
-# Find project root from any subdirectory (walks up to find .git)
+# Find project root from any subdirectory (walks up to find .ck-project-root)
 find_project_root() {
     local dir="${1:-$(pwd)}"
     while [ "$dir" != "/" ]; do
-        if [ -d "$dir/.git" ]; then
+        if [ -f "$dir/.ck-project-root" ]; then
             echo "$dir"
             return 0
         fi