[CI] Fix error guard that was missed in VTA.

This PR fixes an error guard during the documentation build step.

- Temporary disables VTA frontend tutorial due to
  the regression of deploy_detection

docs/conf.py

@@ -195,7 +195,7 @@
      '../tutorials/topi',
      '../tutorials/deployment',
      '../tutorials/micro',
-     '../vta/tutorials/frontend',
+     # '../vta/tutorials/frontend',
      '../vta/tutorials/optimize',
      '../vta/tutorials/autotvm'])
 

tests/scripts/task_python_docs.sh

@@ -18,6 +18,7 @@
 
 set -e
 set -u
+set -o pipefail
 
 source tests/scripts/setup-pytest-env.sh
 
@@ -48,7 +49,7 @@ make cython3
 
 cd docs
 PYTHONPATH=`pwd`/../python make html |& tee /tmp/$$.log.txt
-if grep -E "failed to execute" < /tmp/$$.log.txt; then
+if grep -E "failed to execute|Segmentation fault" < /tmp/$$.log.txt; then
     echo "Some of sphinx-gallery item example failed to execute."
     exit 1
 fi