tooling box: added nginx + polished bash scripts and environment

- add installation method for nginx sites, morty and filtron
- clean up PUBLIC_URL environment in and outside of containers
- clean up comand lines
- handle uWSGI quirks on fedora (emperor mode)
- handle Python quirks on debian (there is no 'python' command anymore)
- lib.sh: add die and die_caller functions
- lxc_suite_install_info is now a function
- lint: shellcheck

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

.config.sh

@@ -18,7 +18,8 @@
 PUBLIC_URL="${SEARX_URL}"
 
 if [[ ${PUBLIC_URL} == "https://searx.me" ]]; then
-    PUBLIC_URL=
+    # hint: Linux containers do not have DNS entries, lets use IPs
+    PUBLIC_URL="http://$(primary_ip)/searx"
 fi
 
 # searx.sh