DEV: Automate aliases of release tag (#36903)

These were handled manually in the last release. `latest-release` and
`beta` should be exact synonyms of `release`, for backwards
compatibility.

https://meta.discourse.org/t/383536/47

lib/tasks/release.rake

@@ -1,6 +1,9 @@
 # frozen_string_literal: true
 
 module ReleaseUtils
+  PRIMARY_RELEASE_TAG = "release"
+  RELEASE_TAGS = [PRIMARY_RELEASE_TAG, "beta", "latest-release"].freeze
+
   def self.dry_run?
     !!ENV["DRY_RUN"]
   end
@@ -161,11 +164,22 @@ namespace :release do
       end
 
       if existing_releases.last && Gem::Version.new(current_version) > existing_releases.last
-        ReleaseUtils.git "tag", "-a", "release", "-m", "latest release"
+        ReleaseUtils::RELEASE_TAGS.each do |synonym_tag|
+          message =
+            if synonym_tag == ReleaseUtils::PRIMARY_RELEASE_TAG
+              "latest release"
+            else
+              "backwards-compatibility alias for `#{ReleaseUtils::PRIMARY_RELEASE_TAG}` tag"
+            end
+          ReleaseUtils.git "tag", "-a", synonym_tag, "-m", message, "-f"
+        end
         if ReleaseUtils.dry_run?
-          puts "[DRY RUN] Skipping pushing 'release' tag to origin"
+          puts "[DRY RUN] Skipping pushing #{ReleaseUtils::RELEASE_TAGS.inspect} tags to origin"
         else
-          ReleaseUtils.git "push", "origin", "-f", "refs/tags/release"
+          ReleaseUtils.git "push",
+                           "origin",
+                           "-f",
+                           *ReleaseUtils::RELEASE_TAGS.map { |tag| "refs/tags/#{tag}" }
         end
       end
     end

spec/tasks/release_spec.rb

@@ -103,6 +103,23 @@ RSpec.describe "tasks/version_bump" do
         expect(output).to include("Tag v2025.05.0 already exists, skipping")
       end
     end
+
+    it "creates all release alias tags when version is latest" do
+      Dir.chdir(local_path) do
+        run "git", "tag", "-a", "v2025.01.0", "-m", "version 2025.01.0"
+
+        File.write("lib/version.rb", fake_version_rb("2025.06.0"))
+        run "git", "add", "."
+        run "git", "commit", "-m", "release 2025.06.0"
+        commit_hash = run("git", "rev-parse", "HEAD").strip
+        run "git", "branch", "release/2025.06"
+
+        capture_stdout { invoke_rake_task("release:maybe_tag_release", commit_hash) }
+
+        tags = run("git", "tag").lines.map(&:strip)
+        ReleaseUtils::RELEASE_TAGS.each { |tag| expect(tags).to include(tag) }
+      end
+    end
   end
 
   it "can create a new release branch" do