Pass in additional packages to be installed as a step in the template Dockerfile

[d-grasshopper]

My actions before raising this issue

• [x] Followed the troubleshooting guide
• [x] Read/searched the docs
• [x] Searched past issues

Expected Behaviour

Ability to pass in additional packages to be installed as part of the template Dockerfile

Current Behaviour

Inability to pass additional packages to be installed as part of template Dockerfile

Possible Solution

Maybe this is already possible, but I have no idea how to pass that argument

Steps to Reproduce (for bugs)

Context

I need to do this, so that I can install the necessary dependencies to build cryptography

Your Environment

• FaaS-CLI version ( Full output from: faas-cli version ):

• Docker version docker version (e.g. Docker 17.0.05 ): 19.03.12

• Are you using Docker Swarm or Kubernetes (FaaS-netes)? k8s with openfaas

• Operating System and version (e.g. Linux, Windows, MacOS): Alpine Linux v3.12 (containerized)

• Code example or link to GitHub repo or gist to reproduce problem:

• Other diagnostic information / logs from troubleshooting guide

Next steps

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[d-grasshopper]

Sorry, guys, I figured it out (I'm new to OpenFAAS).

faas-cli build -f function.yml --parallel=2 --build-arg 'ADDITIONAL_PACKAGE=gcc musl-dev python3-dev libffi-dev openssl-dev cargo'