feat: add endpoint to check app version

Add a new API endpoint that returns the current application version

Signed-off-by: Omar <omar.brbutovic@secomind.com>

Author: OmarBrbutovic

backend/lib/edgehog_web/controllers/version_controller.ex

@@ -0,0 +1,27 @@
+# This file is part of Edgehog.
+#
+# Copyright 2026 SECO Mind Srl
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+defmodule EdgehogWeb.VersionController do
+  use EdgehogWeb, :controller
+
+  @version Mix.Project.config()[:version]
+
+  def show(conn, _params) do
+    json(conn, %{version: @version})
+  end
+end

backend/lib/edgehog_web/router.ex

@@ -54,6 +54,8 @@ defmodule EdgehogWeb.Router do
     interface: :playground,
     socket: EdgehogWeb.GqlSocket
 
+  get "/version", EdgehogWeb.VersionController, :show
+
   scope "/tenants/:tenant_slug" do
     scope "/api" do
       pipe_through :api

backend/test/edgehog_web/controllers/version_controller_test.exs

@@ -0,0 +1,30 @@
+# This file is part of Edgehog.
+#
+# Copyright 2026 SECO Mind Srl
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+defmodule EdgehogWeb.Controllers.VersionControllerTest do
+  use EdgehogWeb.ConnCase, async: true
+
+  @version Mix.Project.config()[:version]
+
+  test "returns the application version", %{conn: conn} do
+    conn = get(conn, "/version")
+
+    assert %{"version" => version} = json_response(conn, 200)
+    assert version == @version
+  end
+end