[Feature Request] Ability to add annotations and environment variables to custom templates

Looking for a way to define annotations and environment variables in a function template that will be added to the generated function's YAML file.

Expected Behaviour

Possibly add annotations and environment sections to template.yml that will be added to < function >.yml on "faas-cli new"

Current Behaviour

Currently not possible.

Are you a GitHub Sponsor (Yes/No?)

Formerly, not currently.

Check at: https://github.com/sponsors/openfaas

• Yes
• No

List All Possible Solutions and Workarounds

Possible solution: Add sections to template.yml that will be added to < function >.yml in new_function.prepareYamlContent()

Which Solution Do You Recommend?

See above

Steps to Reproduce (for bugs)

Context

The goal of this feature would be to allow a function template to define annotations and environment variables that would be appended to the generated function yaml. Specifically I am creating a set of functions with an annotation used for injecting a sidecar container; ideally I could use a custom template that will ensure new functions created from my template would have that annotation added to their function yaml on creation.

Your Environment

• FaaS-CLI version ( Full output from: faas-cli version ):
  CLI:
  commit: 598336a0cad38a79d5466e6a3a9aebab4fc61ba9
  version: 0.12.21

Gateway
uri: https://
version: 0.20.12
sha: a6dbb4cd0285f6dbc0bc3f43f72ceacdbdf6f227
commit: See GitHub for latest changes

Provider
name: faas-netes
orchestration: kubernetes
version: 0.13.4
sha: 6f34f27a2405798b5ee2846f1654bc7754991920

• Docker version ( Full output from: docker version ):
  Client: Docker Engine - Community
  Version: 19.03.13
  API version: 1.40
  Go version: go1.13.15
  Git commit: 4484c46d9d
  Built: Wed Sep 16 17:02:52 2020
  OS/Arch: linux/amd64
  Experimental: true

Server: Docker Engine - Community
Engine:
Version: 20.10.7
API version: 1.41 (minimum version 1.12)
Go version: go1.13.15
Git commit: b0f5bc3
Built: Wed Jun 2 11:54:58 2021
OS/Arch: linux/amd64
Experimental: true
containerd:
Version: 1.4.6
GitCommit: d71fcd7d8303cbf684402823e425e9dd2e99285d
runc:
Version: 1.0.0-rc95
GitCommit: b9ee9c6314599f1b4a7f497e1f1f856fe433d3b7
docker-init:
Version: 0.19.0
GitCommit: de40ad0

• Are you using Docker Swarm (FaaS-swarm ) or Kubernetes (FaaS-netes)?
  Kubernetes (k3s)

• Operating System and version (e.g. Linux, Windows, MacOS):
  Windows 10, WSL 2 running Ubuntu 20.04

• Link to your project or a code example to reproduce issue:

Start with new_function.prepareYamlContent and inspect how template.yml is read and how the generated .yml is assembled during faas-cli new. Define how template annotations and environment sections should be represented, then verify that generated function YAML includes them for a custom template without breaking existing generation.