feat(tasks): Add environment variable directives for mise tasks

[jdx]

Add support for _.file, _.path, _.source directives and false value for removal in [tasks.<name>.env] configurations.

This feature allows loading environment variables from files directly within task definitions, making it easier to synchronize mise tasks with IDE configurations as requested in #4762.

BREAKING CHANGE: there is a minor breaking change. The internal structure of the env key in tasks has to change from an object to array. Unfortunately I don't see a way around this because directives can be specified multiple times so it has to be an array. This is only exposed via mise task info --json so you are only affected if using the env key in that command. If this is an issue for you, please let me know, perhaps we can brainstorm on a solution.

[github-actions]

Hyperfine Performance

mise x -- echo

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
mise-2025.8.3 x -- echo	19.2 ± 0.3	18.6	22.8	1.04 ± 0.03
mise x -- echo	18.4 ± 0.5	17.6	22.7	1.00

mise env

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
mise-2025.8.3 env	18.8 ± 0.6	18.0	23.6	1.04 ± 0.05
mise env	18.0 ± 0.7	17.0	25.1	1.00

mise hook-env

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
mise-2025.8.3 hook-env	18.0 ± 0.2	17.6	18.6	1.05 ± 0.02
mise hook-env	17.2 ± 0.2	16.7	18.4	1.00

mise ls

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
mise-2025.8.3 ls	15.8 ± 0.2	15.4	19.0	1.00
mise ls	15.9 ± 0.2	15.5	18.6	1.01 ± 0.02

xtasks/test/perf

Command	mise-2025.8.3	mise	Variance
install (cached)	190ms	✅ 126ms	+50%
ls (cached)	80ms	80ms	+0%
bin-paths (cached)	64ms	64ms	+0%
task-ls (cached)	500ms	468ms	+6%

✅ Performance improvement: install cached is 50%

[jdx]

bugbot run

[jdx]

bugbot run

[jdx]

no idea why this was set but seems like it was wrong

[glasser]

This appears to cause a regression using _.path with node.
#5913

[joshbode]

I believe this also causes a regression for mise-poetry, which uses MISE_ADD_PATH. The PATH is no longer being updated to add ${VIRTUAL_ENV}/bin

mise 2025.8.3 works, but everything after doesn't update the PATH.

As a workaround, adding _.python.venv explicitly will update the PATH:

[tools]
python = "3.12"
poetry = { version = "2.1", pyproject = "{{ config_root }}/pyproject.toml" }

[env]
_.python.venv = ".venv"

[ssbarnea]

@jdx I think that this change introduced a regression that breaks even the documentation example from https://mise.jdx.dev/environments/ for loading multiple env files.

[env]
_.file = [
    # Load env from the json file relative to this config file
    '.env.json',
    # Load env from the dotenv file at an absolute path
    '/User/bob/.env',
    # Load env from the yaml file relative to this config file and redacts the values
    { path = ".secrets.yaml", redact = true }
]

> mise config
mise ERROR TOML parse error at line 19, column 5
   |
19 |     { path = ".env.secrets", redact = true }
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
invalid type: map, expected a string

I have no idea how to make it work now. I only want to redact only entries from one of the env files.

[risu729]

I think that this change introduced a regression that breaks even the documentation example from https://mise.jdx.dev/environments/ for loading multiple env files.

[env]
_.file = [
    # Load env from the json file relative to this config file
    '.env.json',
    # Load env from the dotenv file at an absolute path
    '/User/bob/.env',
    # Load env from the yaml file relative to this config file and redacts the values
    { path = ".secrets.yaml", redact = true }
]

> mise config
mise ERROR TOML parse error at line 19, column 5
   |
19 |     { path = ".env.secrets", redact = true }
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
invalid type: map, expected a string

I have no idea how to make it work now. I only want to redact only entries from one of the env files.

Fixed in #6148