feat: add option to add helm cm-push args

[manuschillerdev]

This adds the options to pass extra arguments to the helm cm-push command. (#15)

Example usage:

[
    "semantic-release-helm3",
    {
        chartPath: './chart',
        registry: 'https://nexus.domain.tld/repository/department-helm',
        onlyUpdateVersion: true,
        isChartMuseum: true,
        cmPushArgs: `--context-path "/repository/department-helm"`
    }
],

I tested my changes via:

• npm pack in this repo
• referenced as file in my package.json in the application repo"semantic-release-helm3": "file://./semantic-release-helm3-2.5.1.tgz"
• created a dummy commit for semantic-release
• tested it without the extra configuration: export REGISTRY_USERNAME=*** && export REGISTRY_PASSWORD=*** && pnpm -r exec semantic-release --ci=false
• Result: `Method not allowed (405)
• Added the config

  cmPushArgs: `--context-path "/repository/department-helm"` 

• created another dummy commit for semantic-release
• tested it with the new configuration: export REGISTRY_USERNAME=*** && export REGISTRY_PASSWORD=*** && pnpm -r exec semantic-release --ci=false

The package got pushed 🎉

I am not sure what else needs to be considered for this change.

Closes https://github.com/nflaig/semantic-release-helm/issues/15

[nflaig]

Published semantic-release-helm3@2.6.0