Add real release version into the running code (#14870)

* Add real release version into the running code

* Fix warnings

app/controllers/api/v0/instances_controller.rb

@@ -13,7 +13,7 @@ module Api
           name: Settings::Community.community_name,
           registered_users_count: User.registered.estimated_count,
           tagline: Settings::Community.tagline,
-          version: "edge.#{Time.now.utc.strftime('%Y%m%d')}.0",
+          version: release_version,
           visibility: visibility
         }, status: :ok
       end
@@ -25,6 +25,24 @@ module Api
 
         Settings::UserExperience.public ? "public" : "private"
       end
+
+      def release_version
+        File.read(Rails.root.join(".release-version"))
+
+      # Accommodate the .release-version file not existing in the case where
+      # this deployment is deployed from a checkout/snapshot of the code.
+      rescue StandardError
+        # Get the latest modified file in the app. We don't use git in case it's
+        # being run from a snapshot of the code outside a git repo (for example:
+        # https://github.com/forem/forem/archive/refs/heads/main.zip), but
+        # instead we use the latest modified time ("mtime") from application
+        # code.
+        latest_mtime = Dir[Rails.root.join("{app,config,db,lib}/**/*")]
+          .max_by { |filename| File.mtime(filename) }
+          .then { |filename| File.mtime(filename) }
+
+        "edge.#{latest_mtime.strftime('%Y%m%d')}.0"
+      end
     end
   end
 end

scripts/release

@@ -69,6 +69,9 @@ begin
   puts "Merged #{source} into #{channel}"
 
   begin
+    run "echo '#{tag}' > .release-version"
+    run "git add .release-version"
+    run "git commit --message 'Version #{tag}'"
     run "git tag #{tag}"
     puts "Tagged #{tag}"
   rescue StandardError