Add Health Check endpoint (#392)

* add simple health endpoint

* add curl and healthcheck to dockerfile

* convert to view

* add simple test

* Add unhealthy test

* Cleanup

* check for LD_SERVER_PORT env var in healthcheck def

* Revert changes to middlewares.py

Co-authored-by: Sascha Ißbrücker <sascha.issbruecker@gmail.com>

bookmarks/views/__init__.py

@@ -1,3 +1,4 @@
 from .bookmarks import *
 from .settings import *
 from .toasts import *
+from .health import health

bookmarks/views/health.py

@@ -0,0 +1,20 @@
+from django.db import connections
+from django.http import JsonResponse
+
+from bookmarks.views.settings import app_version
+
+
+def health(request):
+    code = 200
+    response = {
+        'version': app_version,
+        'status': 'healthy'
+    }
+
+    try:
+        connections['default'].ensure_connection()
+    except Exception:
+        response['status'] = 'unhealthy'
+        code = 500
+
+    return JsonResponse(response, status=code)