Update Dockerfile

Dockerfile

@@ -37,7 +37,7 @@ ENV POSTGRES_USER=${POSTGRES_USER} \
     DB_POSTGRESDB_PASSWORD=${POSTGRES_PASSWORD} \
     DB_POSTGRESDB_DATABASE=${POSTGRES_DB} \
     VIRTUAL_ENV=$WORKDIR/venv \
-    ENV WEBDAV_URL=${WEBDAV_URL} \
+    WEBDAV_URL=${WEBDAV_URL} \
     WEBDAV_USER=${WEBDAV_USER} \
     WEBDAV_PASSWORD=${WEBDAV_PASSWORD} \
     PATH="$WORKDIR/venv/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:$PATH"