use implementation-agnostic conda package for test

add initial dotnet support

Update pre-commit version in sample config

don't pass through -p if using the default version

update rbenv / ruby-build

fix a few spelling errors

found via `pre-commit try-repo https://github.com/codespell-project/codespell --all-files`

check cygwin mismatch earlier

Fix ruby hooks when --format-executable is in gemrc

I used this gemrc to break things (default on opensuse):

```yaml
---
:benchmark: false
:install...

remove hardcoded python location

Drop python.exe extension on windows in shebang line to fix pyenv-win setup

fix excess whitespace in traceback in error

fix for node healthy() when system executable moves

fix atomic file replace on windows

fix cache of invalidated unhealthy environment version info

remove docker_is_running check from source

Moved to testing.util so it can be used for the skipif_cant_run_docker
test hooks.

allow pre-commit to succeed on a readonly store directory

Save diff between hook executions

warn on old list-style configuration

better error handling when Store is readonly

Add --no-allow-missing-config option to init-templatedir

Add a `--no-allow-missing-config` option to the `init-templatedir`
command. Enable configuration...

require healthy() after installation

upgrade mypy to get typeshed fixes

fix node hooks when NPM_CONFIG_USERCONFIG is set

xfail a flaky node test on windows

Add three missing required dependencies in CONTRIBUTING.md

skip rbenv if ruby and gem are installed with default language_version

There could still be missing dependencies, I'm not using a fresh environement
to test that. Also...

prevent infinite recursion of post-checkout on clone

normalize slashes even earlier on windows for filenames

use the shuffle method of Random instead

avoid a UnicodeError on windows with non-charmap characters

slightly speed up tests by avoiding pre-commit install

Committed via https://github.com/asottile/all-repos

Expose an env variable that indicates if pre-commit is running

Run pre-commit autoupdate

Committed via https://github.com/asottile/all-repos

refuse to migrate an invalid configuration

Unset GEM_PATH for ruby hooks

Use the real path of the cache root

Maintain scalar quoting style when autoupdate re-writes rev

If rev is wrapped in single or double quotes (e.g. due to a yamllint quoted-strings rule), when
...

Improve python healthy() and eliminate python_venv

Fix some typos

- the `healthy()` check now requires virtualenv 20.x's metadata
- `python_venv` is obsolete now ...

yay french strings

fix hooks firing during staged_files_only

Add dummy go.mod for local "empty" installs

disable pip version check in python hooks

Implement post-commit