grafana/toolkit: Unpublish previous "next" version when releasing a new one (#18552)

* Unpublish previous canary when releasing a new one

* Update scripts/circle-release-next-packages.sh

* Shellcheck fix

scripts/circle-release-next-packages.sh

-#!/bin/bash
+#!/usr/bin/env bash
 
 function parse_git_hash() {
   git rev-parse --short HEAD 2> /dev/null | sed "s/\(.*\)/\1/"
@@ -11,9 +11,20 @@ function prapare_version_commit () {
   git commit -am "Version commit"
 }
 
-#Get current version from lerna.json
+function unpublish_previous_canary () {
+  echo $'\nUnpublishing previous canary packages'
+  for PACKAGE in ui toolkit data runtime
+  do
+    # dist-tag next to be changed to canary when https://github.com/grafana/grafana/pull/18195 is merged
+    CURRENT_CANARY=$(npm view @grafana/${PACKAGE} dist-tags.next)
+    echo "Unpublish @grafana/${PACKAGE}@${CURRENT_CANARY}"
+    npm unpublish "@grafana/${PACKAGE}@${CURRENT_CANARY}"
+  done
+}
+
+# Get current version from lerna.json
 PACKAGE_VERSION=$(grep '"version"' lerna.json | cut -d '"' -f 4)
-# Get short current commit's has
+# Get  current commit's short hash
 GIT_SHA=$(parse_git_hash)
 
 echo "Commit: ${GIT_SHA}"
@@ -31,11 +42,14 @@ else
   echo $'\nGit status:'
   git status -s
 
+
   echo $'\nBuilding packages'
   yarn packages:build
 
   prapare_version_commit
 
+  unpublish_previous_canary
+
   echo $'\nPublishing packages'
   yarn packages:publishNext
 fi