Option to run only one execution when using TG hooks with -all option

[aleksanderaleksic]

When running terragrunt apply-all /plan-all multiple executions of tgmigrate meaning there is a migrationcheck for one module at the same time. This will cause race condition.

Suggestion is to add a flag like --max-concurrent-executions 1 where if it is applied the executions above execution nr.1 would be skipped. This "state" would be stored localy in a file, but it must be known where the file is located.

[aleksanderaleksic]

After trying to fix this I think its best to implement a "before_all" hook on the terragrunt repo. I will try to make a PR for that shortly, in the meantime you should run tgmigrate manually before the apply.

[aleksanderaleksic]

Haven't had time to look into the before-all hook on the terragrunt repo but I will try to get time for that later