fixes #3737

### QC
<!-- Make sure that you can tick the boxes below. -->

* [x] The PR contains a test case for the changes or the changes are
already covered by an existing test case.
* [X] The documentation (`docs/`) is updated to reflect the changes or
this is not necessary (e.g. if the change does neither modify the
language nor the behavior or functionalities of Snakemake).


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Bug Fixes**
* Source cache is now mounted in Singularity/Apptainer runs whenever the
cache directory exists, even if extra container arguments are provided;
a debug message is logged when the cache is missing.

* **Tests**
* Added an integration test validating source-cache binding alongside
custom bind arguments.
* Added a sample workflow rule to verify copying a source file to an
output inside a container.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
Co-authored-by: Cade Mirchandani <[email protected]>

The logger plugin interface is now at 2.0.0, bumping the version
required here.

Was trying to understand the logging system better and ended up filling
in most of the missing type annotations. These were mostly pretty clear,
but there are a few potential issues:

- The first argument of `is_quiet_about()` and the `quiet` attribute of
`DefaultFormatter` and `DefaultFilter` were annotated as `Quietness`,
which does not seem correct. I have changed these to
`Container[Quietness]`.
- `LoggerManager` is a bit of a difficult case because a lot of
attributes are `None` before `setup()` is called. I have annotated these
with `Optional`, but it might make more sense to do the typing as if
`setup()` had already been called, even if it's not technically correct
just after construction.

Also corrected the docstring of `get_event_level()`.

### QC
<!-- Make sure that you can tick the boxes below. -->

* [x] The PR contains a test case for the changes or the changes are
already covered by an existing test case.
* [x] The documentation (`docs/`) is updated to reflect the changes or
this is not necessary (e.g. if the change does neither modify the
language nor the behavior or functionalities of Snakemake).

I ran the test suite applying
[typeguard](https://typeguard.readthedocs.io) to the logging module.
Nearly every function with added/changed annotations was covered.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- New Features
- Improved logging output: clearer messages, enhanced color/TTY
handling, and finer control over quietness and failed-log visibility.

- Refactor
- Standardized and strengthened public logging interfaces, handlers,
formatters, and filters for more predictable terminal and file output.

- Documentation
- Updated logging docs to reflect clarified behaviors and configuration
options.

- Chores
- Broad typing and public API alignment to improve maintainability
without changing user-facing behavior.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

This is the new announcement action for the Snakemake announcement bot
on Mastodon (https://fediscience.org/@snakemake)

Its message is basic. Please have a look.

Note, that the CI has to run in release mode before anything can be told
for its workings.

edit - PS: the PR is labelled "docs" in lack for a better conventional
commit category.


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Releases are now automatically announced on Mastodon, sharing version,
highlights, changelog links, and release notes to keep users informed
without monitoring the repo.

* **Chores**
* CI now posts Mastodon release announcements only for official release
commits tied to changelog updates, ensuring accurate, gated, and timely
notifications.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

🤖 I have created a release *beep* *boop*
---


##
[9.11.7](v9.11.6...v9.11.7)
(2025-10-01)


### Bug Fixes

* Add type annotations in logging module
([#3757](#3757))
([63404b2](63404b2))
* source_path not mounted
([#3738](#3738))
([86e30b3](86e30b3))


### Documentation

* mastodon announcements
([#3723](#3723))
([7da1b18](7da1b18))

---
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Please](https://github.com/googleapis/release-please). See
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