A CI pipeline in one file

## format

```bash
cargo fmt --check
```

## lint

```meta
sources = ["src/**/*.rs"]
```

```bash
cargo clippy -- -D warnings
```

## test

```meta
sources = ["src/**/*.rs", "tests/**/*.rs"]
retries = 1
```

```bash
cargo test
```

## ci

```meta
depends = ["format", "lint", "test"]
parallel = true
```

```bash
echo ok
```

Run it with mq-task ci -k to see every failure at once, or mq-task ci -j 2 to limit concurrency.