Add missing VERSION environment variable

docker-compose.yml

@@ -18,6 +18,7 @@ x-django-build-env: &django-build-env
 
 x-django-env: &django-env
   <<: *django-build-env
+  VERSION:
 
   # Email
   EMAIL_HOST:

src/newsreader/conf/version.py

@@ -3,8 +3,10 @@ import subprocess
 
 
 def get_current_version(debug=True):
-    if "VERSION" in os.environ:
-        return os.environ["VERSION"]
+    version = os.environ.get("VERSION")
+
+    if version:
+        return version
 
     if debug:
         try: