Update pytest docker image to 0.5.4

Author: jmitrevs

test/pytest/ci-template.yml

@@ -1,10 +1,11 @@
 .pytest:
   stage: test
-  image: gitlab-registry.cern.ch/fastmachinelearning/hls4ml-testing:0.4.base
+  image: gitlab-registry.cern.ch/fastmachinelearning/hls4ml-testing:0.5.4.base
   tags:
     - k8s-default
   before_script:
     - source ~/.bashrc
+    - git config --global --add safe.directory /builds/fastmachinelearning/hls4ml
     - git submodule update --init --recursive hls4ml/templates/catapult/
     - if [ $EXAMPLEMODEL == 1 ]; then git submodule update --init example-models; fi
     - conda activate hls4ml-testing