CloudBuild --cache-from for dependencies of CloudFunctions - google-cloud-functions

Question

Several cloud functions use the same requirements: a few libraries and a utility module in localpackage. All of those functions are built and deployed by CloudBuild.
Is there any way to use CloudBuild '--cache-from' feature to use the same base for all those cloud functions?
Here are the steps in yaml file to build and deploy a cloud function:
steps:
# create gcf source directory
- name: 'bash'
args:
- '-c'
- |
echo 'Creating gcf_source directory for ${_GCF_NAME}'
mkdir _gcf_source
cp -r cloudfuncs/${_GCF_NAME}/. _gcf_source
rm -f _gcf_source/readme.md
mkdir _gcf_source/localpackage
touch _gcf_source/localpackage/__init__.py
cp cloudfuncs/localpackage/gcf_utils.py _gcf_source/localpackage
echo "" >> _gcf_source/requirements.txt
cat cloudfuncs/localpackage/requirements.txt >> _gcf_source/requirements.txt
- name: 'gcr.io/cloud-builders/gcloud'
args:
- functions
- deploy
- ${_GCF_NAME}

Answer 1

Cloud Build is serverless and you can't keep the data from one execution to another one.
However, you have 2 solutions
Build a container with your localpackage and use it in your subsequent deployment as the container of the step.
Store the file in Google Cloud Storage and load them in your Cloud Build workspace as first step of your deployments. The artifact feature could help you in this task (to save files).