Add SDKMan and HomeBrew release process documentation (#1093)

Signed-off-by: tvallin <[email protected]>

Author: tvallin

cli/RELEASE.md

@@ -0,0 +1,66 @@
+# Helidon CLI Release
+
+The CLI is currently released to `HomeBrew` and `SDKMan!`. This document explain the steps to release a new version.
+
+## HomeBrew
+
+HomeBrew Core has a Helidon Formula to allow every user to easily install the CLI. To release a new version, 
+update the `url` configuration key to the new version. The Formula has some basic testing to make sure the CLI can generate
+project. Nevertheless, for more test coverage, it is possible to test the updated Formula locally. Update the formula in 
+your local Homebrew (`homebrew/Library/Taps/homebrew/homebrew-core/h/helidon.rb`) and use this command:
+
+```shell
+export HOMEBREW_NO_INSTALL_FROM_API=1
+brew install --build-from-source --verbose helidon
+```
+
+Formula: https://github.com/Homebrew/homebrew-core/blame/master/Formula/h/helidon.rb
+
+## SDKMan!
+
+Use SDKMan REST endpoint to publish the new released binaries with our credentials available in the Vault.
+
+1. Release a new candidate
+
+```shell
+curl -X POST \
+-H "Consumer-Key: CONSUMER_KEY" \
+-H "Consumer-Token: CONSUMER_TOKEN" \
+-H "Content-Type: application/json" \
+-H "Accept: application/json" \
+-d '{"candidate": "helidon", "version": "${version}", "url": "https://github.com/helidon-io/helidon-build-tools/releases/download/${version}/helidon-cli.zip"}' \
+https://vendors.sdkman.io/release
+```
+The release endpoint support `POST` and `DELETE` HTTP methods. Releasing a new candidate does not make it the default
+version. It is considered a minor release, setting the new candidate as a default version is major release. 
+
+2. Set existing Version as Default for Candidate (Optional)
+
+Use the following command to set a version as default.
+
+```shell
+curl -X PUT \
+-H "Consumer-Key: CONSUMER_KEY" \
+-H "Consumer-Token: CONSUMER_TOKEN" \
+-H "Content-Type: application/json" \
+-H "Accept: application/json" \
+-d '{"candidate": "helidon", "version": "${version}"}' \
+https://vendors.sdkman.io/default
+```
+
+3. Broadcast a Structured Message (Optional)
+
+Announce the new release through SDKMan social media (X feed) and broadcast channel of SDKMAN! CLI. 
+
+```shell
+curl -X POST \
+-H "Consumer-Key: CONSUMER_KEY" \
+-H "Consumer-Token: CONSUMER_TOKEN" \
+-H "Content-Type: application/json" \
+-H "Accept: application/json" \
+-d '{"candidate": "helidon", "version": "${version}", "url": "https://helidon.io"}' \
+https://vendors.sdkman.io/announce/struct
+```
+`url`: display the url where user can find the binaries (or any other useful information).
+The broadcast message looks like this `helidon ${version} available for download. https://helidon.io`
+