Add an option on Cronjobs > New to set 'no-overlap'

[stefanpejcic]

for https://community.openpanel.org/d/209-how-to-avoid-parallel-cron-jobs-execution-in-openpanel :

1. on /cronjobs?view=code we should before user saves validate the format, make sure its format is:

   [job-exec "apache"]
   schedule = @every 30s
   container = apache
   command = curl https://openpanel.com/
   
   [job-exec "php-fpm-8.4"]
   schedule = @every 30m
   container = php-fpm-8.4
   command = curl https://openpanel.com/enterprise
   

   empty row between them is required for gui

   and may have an optional no-overlap at end for each:

   [job-exec "apache"]
   schedule = @every 30s
   container = apache
   command = curl https://openpanel.com/
   no-overlap
   
   [job-exec "php-fpm-8.4"]
   schedule = @every 30m
   container = php-fpm-8.4
   command = curl https://openpanel.com/enterprise
   

2. on /cronjobs/new template add a checkbox that will add that no-overlap if selected when user is creating the job

3. on /cronjobs table show column for overlap and on edit field to make it checkbox or not - not removes for it if exists, checked adds it if not exist.

[stefanpejcic]

implemented in 2.0.1