Refactor variable assignments and improve script readability in validate-plex-backups.sh and validate-plex-recovery.sh

- Changed inline variable assignments to separate declaration and assignment for clarity.
- Updated condition checks and log messages for better readability and consistency.
- Added a backup of validate-plex-recovery.sh for safety.
- Introduced a new script run-docker-tests.sh for testing setup in Docker containers.
- Enhanced ssh-login.sh to improve condition checks and logging functionality.

backup-docker.sh

@@ -2,7 +2,7 @@
 
 # vaultwarden
 docker stop vaultwarden
-tar zcf /home/acedanger/backup/docker-data/vaultwarden-data-bk-`date +%Y%m%d`.tar.gz  /var/lib/docker/volumes/vaultwarden_data/_data
+tar zcf "/home/acedanger/backup/docker-data/vaultwarden-data-bk-$(date +%Y%m%d).tar.gz"  /var/lib/docker/volumes/vaultwarden_data/_data
 docker start vaultwarden
 
 # paperless
@@ -14,12 +14,12 @@ docker start vaultwarden
 
 # uptime-kuma
 docker stop uptime-kuma
-tar zcf /home/acedanger/backup/docker-data/uptime-kuma-data-bk-`date +%Y%m%d`.tar.gz /var/lib/docker/volumes/uptime-kuma/_data
+tar zcf "/home/acedanger/backup/docker-data/uptime-kuma-data-bk-$(date +%Y%m%d).tar.gz" /var/lib/docker/volumes/uptime-kuma/_data
 docker start uptime-kuma
 
 # send a notification to https://notify.peterwood.rocks\lab
 curl \
   -H priority:default \
-  -H tags:backup,docker,vaultwarden,uptime-kuma,${HOSTNAME} \
+  -H tags:backup,docker,vaultwarden,uptime-kuma,"${HOSTNAME}" \
   -d "Completed backup of vaultwarden, uptime-kuma" \
   https://notify.peterwood.rocks/lab