🐛 reusing ReleaseNotes._instance breaks monorepo package-specific commits

[scottnath]

Hi @momocow

I love this plugin and using emojis instead of angular commit msgs, so thank you!

I'm seeing a bug when using a monorepo where ReleaseNotes' knowledge of commits persists when semantic-release is iterating across packages in a monorepo. Whichever package is first, the commits related to that package are the only commits listed for all subsequent packages.

Example repo: https://github.com/scottnath/experiments

Monorepo plugin: https://github.com/qiwi/multi-semantic-release

The fix I found

The ReleaseNotes class .get reuses the ._instance instead of using the current set of commits it should be receiving. I was able to make the monorepo packages have separate release notes by having .get freshly instantiate the class each time:

see the change: scottnath/semantic-release-gitmoji@main...release-notes-class

  static get (context, releaseNotesOptions) {
    ReleaseNotes._instance = new ReleaseNotes(context, releaseNotesOptions)
    return ReleaseNotes._instance
  }

I don't know if this is a valid fix because I'm not sure what use case(s) exist for not using the class with new, but figured it would be a good place to start to find a final fix.

Using current semantic-release-gitmoji

The dependencies:

  "dependencies": {
    "@qiwi/multi-semantic-release": "^7.0.0",
    "semantic-release": "^21.1.1",
    "semantic-release-gitmoji": "v1.6.4"
  }

example PR: scottnath/experiments#1
Release output in GitHub Actions: https://github.com/scottnath/experiments/actions/runs/6100581263/job/16555183681

Release Notes for package scottnath-experiment-a

# v0.1.0-add-release.1 (https://github.com/scottnath/experiments/compare/scottnath-experiments-a@0.0.2-add-release.1...scottnath-experiments-a@0.1.0-add-release.1) (2023-09-06)

## ✨ New Features

    * 67f2e78 (https://github.com/scottnath/experiments/commit/67f2e78) ✨ another change in A

## 🐛 Fixes

    * fd83f3d (https://github.com/scottnath/experiments/commit/fd83f3d) 🆕 change to A

Release notes for package scottnath-experiment-b

# v0.1.0-add-release.1 (https://github.com/scottnath/experiments/compare/scottnath-experiments-b@0.0.2-add-release.1...scottnath-experiments-b@0.1.0-add-release.1) (2023-09-06)

## ✨ New Features

    * 67f2e78 (https://github.com/scottnath/experiments/commit/67f2e78) ✨ another change in A

## 🐛 Fixes

    * fd[83](https://github.com/scottnath/experiments/actions/runs/6100581263/job/16555183681#step:6:84)f3d (https://github.com/scottnath/experiments/commit/fd83f3d) 🆕 change to A

### Dependencies

    * scottnath-experiments-a: upgraded to 0.1.0-add-release.1

Using the adjusted package at scottnath/semantic-release-gitmoji

scottnath/semantic-release-gitmoji@main...release-notes-class

The dependencies:

  "dependencies": {
    "@qiwi/multi-semantic-release": "^7.0.0",
    "semantic-release": "^21.1.1",
    "semantic-release-gitmoji": "github:scottnath/semantic-release-gitmoji#release-notes-class"
  }

example PR: scottnath/experiments#2
Release output in GitHub Actions: https://github.com/scottnath/experiments/actions/runs/6100581263/job/16555183681

Release Notes for package scottnath-experiment-a

# v0.1.0-add-release-experiment.1 (https://github.com/scottnath/experiments/compare/scottnath-experiments-a@0.0.1...scottnath-experiments-a@0.1.0-add-release-experiment.1) (2023-09-06)

## ✨ New Features

    * 67f2e78 (https://github.com/scottnath/experiments/commit/67f2e78) ✨ another change in A

## 🐛 Fixes

    * a3349cb (https://github.com/scottnath/experiments/commit/a3349cb) 🐛 add basic files to packages 
    * 2c1d02a (https://github.com/scottnath/experiments/commit/2c1d02a) 🐛 changes to b 
    * af83eca (https://github.com/scottnath/experiments/commit/af83eca) 🐛 only in a 
    * bfbfadb (https://github.com/scottnath/experiments/commit/bfbfadb) 🐛 change in A 
    * 9ef89fc (https://github.com/scottnath/experiments/commit/9ef89fc) 🚀 set up one pkg fully 
    * 4eb481b (https://github.com/scottnath/experiments/commit/4eb481b) 🎨 changes to A only 
    * fd83f3d (https://github.com/scottnath/experiments/commit/fd83f3d) 🆕 change to A

Release notes for package scottnath-experiment-b

# v0.0.2-add-release-experiment.1 (https://github.com/scottnath/experiments/compare/scottnath-experiments-b@0.0.1...scottnath-experiments-b@0.0.2-add-release-experiment.1) (2023-09-06)

## 🐛 Fixes

    * a3349cb (https://github.com/scottnath/experiments/commit/a3349cb) 🐛 add basic files to packages 
    * 2c1d02a (https://github.com/scottnath/experiments/commit/2c1d02a) 🐛 changes to b 
    * 56cf3f9 (https://github.com/scottnath/experiments/commit/56cf3f9) 🐛 change to B 
    * b6ea03a (https://github.com/scottnath/experiments/commit/b6ea03a) 🐛 change in B 
    * 9ef[89](https://github.com/scottnath/experiments/actions/runs/6101134859/job/16556837347#step:6:90)fc (https://github.com/scottnath/experiments/commit/9ef89fc) 🚀 set up one pkg fully 
    * 2673e5c (https://github.com/scottnath/experiments/commit/2673e5c) 🚀 fixing tagformat in b 
    * ecc71ca (https://github.com/scottnath/experiments/commit/ecc71ca) 🎨 changes to B only

### Dependencies

    * scottnath-experiments-a: upgraded to 0.1.0-add-release-experiment.1

thank you for any help!