Update Releasing section in contributing (#1577)

* Update Releasing section in contributing

* create snap readme; add go install github.com/digitalocean/github-changelog-generator@latest
==> list merged PRs since last release to review changes to release

CONTRIBUTING.md

@@ -203,44 +203,17 @@ To cut a release, push a new tag (versioning discussed below).
  doing (bugfix, feature or breaking).
  `doctl` follows [semantic versioning](https://semver.org), ask if you aren't sure.
 
-1. Tag the release using `BUMP=(bugfix|feature|breaking) make tag`.
- (Bugfix, feature and breaking are aliases for semver's patch, minor and major.
- BUMP will also accept `patch`, `minor` and `major`, if you prefer). The command
- assumes you have a remote repository named `origin` pointing to this
- repository. If you'd prefer to specify a different remote repository, you can
- do so by setting `ORIGIN=(preferred remote name)`.
-
-The new tag triggers the release.
-
-### Snap
-
-Snap packages are automatically built and uploaded as part of the GitHub Actions
-release workflow.
-
-To build a snap package locally for testing, first install `snapcraft`.
-
-On Ubuntu, run:
-
- sudo snap install snapcraft --classic
-
-Or on MacOS, run:
-
- brew install snapcraft
-
-Finally, build the package by running:
-
- make snap
-
-More details about the snap package can be found in the `snap/snapcraft.yaml` file.
-
-### Updating Homebrew
+1. Synchronize your local repository with all the tags that have been created or updated on the remote main branch
+ ```bash
+ git checkout main
+ git pull --tags
+ ```
 
-Using the url and sha from the github release, update the
-[homebrew formula](https://github.com/Homebrew/homebrew-core/blob/master/Formula/doctl.rb).
-You can use `brew bump-formula-pr doctl`, or
+1. Creates a new tag and push the tag to the remote repository named origin
+ ```bash
+ git tag <new-tag> # Example: git tag v1.113.0
+ git push origin tag <new-tag> # Example: git push origin tag v1.113.0
+ ```
 
-1. fork `homebrew-core`
-1. create a branch named `doctl-<version>`
-1. update the url and the sha256 using the values for the archive in the github release
-1. commit your changes
-1. submit a PR to homebrew
+To learn a bit more about how that all works, check out [goreleaser](https://goreleaser.com/intro) 
+and the config we use for it: [.goreleaser.yml](https://github.com/digitalocean/doctl/blob/main/.goreleaser.yml)

snap/README.md

@@ -0,0 +1,20 @@
+# Snap
+
+Snap packages are automatically built and uploaded as part of the GitHub Actions
+release workflow.
+
+To build a snap package locally for testing, first install `snapcraft`.
+
+On Ubuntu, run:
+
+ sudo snap install snapcraft --classic
+
+Or on MacOS, run:
+
+ brew install snapcraft
+
+Finally, build the package by running:
+
+ make snap
+
+More details about the snap package can be found in the `snap/snapcraft.yaml` file.