Avoid copying the test logs when the Git repo dir and artifact dir are the same file.

This case can occur when running the CI script manually and would print a long list
of warnings.

PiperOrigin-RevId: 419435421

Author: fredrec

ci/kokoro/gcp_ubuntu/build.sh

@@ -38,10 +38,13 @@ GIT_REPO_DIR="${GIT_REPO_DIR:-$DEFAULT_REPO_DIR}"
 
 cleanup() {
   # Collect the test logs.
-  docker exec tfmot find \
-    -L "bazel-testlogs" \
-    \( -name "test.log" -o -name "test.xml" \) \
-    -exec cp --parents {} "${KOKORO_ARTIFACTS_DIR}" \;
+  # Skipped when the container workdir is $KOKORO_ARTIFACTS_DIR.
+  if docker exec tfmot test ! . -ef "${KOKORO_ARTIFACTS_DIR}"; then
+    docker exec tfmot find \
+      -L "bazel-testlogs" \
+      \( -name "test.log" -o -name "test.xml" \) \
+      -exec cp --parents {} "${KOKORO_ARTIFACTS_DIR}" \;
+  fi
 
   # Rename test.xml to sponge_log.xml so they show up in Sponge.
    docker exec tfmot find "${KOKORO_ARTIFACTS_DIR}/bazel-testlogs" \