Fix run_tests.sh: use find -L to follow runfiles symlinks.

Bazel runfiles directories for external repos are symlinks that
find doesn't traverse without -L. Also use $TEST_SRCDIR for the
search root.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sayrer

rust/swift-bindings/run_tests.sh

@@ -1,7 +1,9 @@
 #!/bin/bash
 # Wrapper script to run Swift tests on Linux via bazel test
-# Dynamically find the Swift runtime libs directory in the runfiles tree
-SWIFT_RUNTIME_DIR=$(dirname "$(find . -path '*/usr/lib/swift/linux/libswiftCore.so' -print -quit 2>/dev/null)")
-FFI_DIR=$(dirname "$(find . -name 'libtwitter_text_ffi.so' -print -quit 2>/dev/null)")
+# Dynamically find the Swift runtime libs directory in the runfiles tree.
+# -L is required because Bazel runfiles uses symlinks for external repo directories.
+RUNFILES="${TEST_SRCDIR:-.}"
+SWIFT_RUNTIME_DIR=$(dirname "$(find -L "$RUNFILES" -path '*/usr/lib/swift/linux/libswiftCore.so' -print -quit 2>/dev/null)")
+FFI_DIR=$(dirname "$(find -L "$RUNFILES" -name 'libtwitter_text_ffi.so' -print -quit 2>/dev/null)")
 export LD_LIBRARY_PATH="${SWIFT_RUNTIME_DIR}:${FFI_DIR}:${LD_LIBRARY_PATH}"
 exec "$1"