Hot reload nginx after pruning cache

changelog/items/other/nginx-prune-hot-reload.md

@@ -0,0 +1 @@
+- Hot reload Nginx after pruning cache files.

scripts/nginx-prune.sh

@@ -2,5 +2,8 @@
 
 # We execute the nginx cache pruning subscript from docker container so that we
 # can run the pruning script in user crontab without sudo.
-
 docker run --rm -v /home/user:/home/user bash /home/user/skynet-webportal/scripts/lib/nginx-prune-cache-subscript.sh
+
+# Some cache files are deleted, but are kept open, we hot reload nginx to get
+# them closed and removed from filesystem.
+docker exec nginx nginx -s reload