feature #31310 [DependencyInjection] Added option `ignore_errors: not_found` for imported config files (pulzarraider)
feature #31310 [DependencyInjection] Added option `ignore_errors: not_found` for imported config files (pulzarraider)

This PR was merged into the 4.4 branch.

Discussion
----------

[DependencyInjection] Added option `ignore_errors: not_found` for imported config files

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | yes
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | symfony/symfony-docs#11647

If someone want to add optional config file. The only available choice was to add `ignore_errors: true` option

e.g.
```
imports:
    - { resource: parameters.yml, ignore_errors: true }
```

But this will hide all errors in imported file. We ran in many situations that broke our Symfony applications because we had a typo in this imported files.

This PR introduce new possible value `not_found` for `ignore_errors` option. It can be used for optional config files like the `ignore_errors: true`, but it will ignore only the file non-existence, not the possible syntax errors inside.

Usage:
```
imports:
    - { resource: parameters.yml, ignore_errors: not_found}
```

Commits
-------

e0ee01c10d [DependencyInjection] Added option `ignore_errors: not_found` while importing config files

symfony/Config