macOS CI: Move the Bazel vendor_dir to ${HOME} to workaround a Bazel issue
where it does not work when it is in ${TMP} and also fix the quoting
which was causing it to incorrectly receive the argument

https://github.com/bazelbuild/bazel/issues/27156

PiperOrigin-RevId: 823141075
Change-Id: I465f6bda0d94f4e464fa7ce3c1ee019aec78db69

ci/macos_xcode_bazel.sh

diff --git a/ci/macos_xcode_bazel.sh b/ci/macos_xcode_bazel.sh
index f19cd50..4e73847 100755
--- a/ci/macos_xcode_bazel.sh
+++ b/ci/macos_xcode_bazel.sh
@@ -37,8 +37,8 @@
 
 # Use Bazel Vendor mode to reduce reliance on external dependencies.
 if [[ ${KOKORO_GFILE_DIR:-} ]] && [[ -f "${KOKORO_GFILE_DIR}/distdir/abseil-cpp_vendor.tar.gz" ]]; then
-  tar -xf "${KOKORO_GFILE_DIR}/distdir/abseil-cpp_vendor.tar.gz" -C "${TMP}/"
-  BAZEL_EXTRA_ARGS="--vendor_dir=\"${TMP}/abseil-cpp_vendor\" ${BAZEL_EXTRA_ARGS:-}"
+  tar -xf "${KOKORO_GFILE_DIR}/distdir/abseil-cpp_vendor.tar.gz" -C "${HOME}/"
+  BAZEL_EXTRA_ARGS="--vendor_dir=${HOME}/abseil-cpp_vendor ${BAZEL_EXTRA_ARGS:-}"
 fi
 
 # Print the compiler and Bazel versions.