- Task is a very popular, well-maintained, Go-based task runner with a nearly identical spec to `kit`, as can be seen in the diff
  - basically can do virtually all of the same things and a good number of other things, with lots of docs and active maintenances

- intentionally made this commit have as few changes as possible to reduce the diff and make it look very familiar
  - used one-line arrays instead of multi-line to be similar to `kit`'s `make`-like task dep list
  - used singular `cmd` syntax instead of the usual plural `cmds` syntax

Signed-off-by: Anton Gilgur <[email protected]>

- required name change
  - convention to use capital for the first letter: https://taskfile.dev/styleguide/#use-taskfileyml-and-not-taskfileyml

Signed-off-by: Anton Gilgur <[email protected]>

- new lines between tasks: https://taskfile.dev/styleguide/#add-spaces-between-tasks
- consistent ordering of keywords: https://taskfile.dev/styleguide/#use-the-correct-order-of-keywords
  - strangely it doesn't mention keywords _within_ tasks, but I did `cmd` -> `dir` -> `deps` -> `sources` -> `env` consistently
    - similar to how I ordered the GH Actions keywords too

Signed-off-by: Anton Gilgur <[email protected]>

- following the installation guide: https://taskfile.dev/installation/
  - use `npm` for the `Makefile` install as it's compatible on different OSes and matches some of our existing tools (like `mdspell`, `markdownlint`, etc)
    - NOTE: this does still need adding to the Nix dir

- replace `kit` in `Makefile`, `pre-build.sh`, and `ci-build.yaml` with `task`

Signed-off-by: Anton Gilgur <[email protected]>

Signed-off-by: Anton Gilgur <[email protected]>

- it was removed when `goreman` was replaced by `kit` in 05e1318
  - add it back since `task` does not do port-forwarding

- should hopefully fix all the CI issues in E2E tests

Signed-off-by: Anton Gilgur <[email protected]>

- i.e. `controller`, `server`, and `ui`, which all just run forever
  - previously `task` was waiting for these to complete as `deps`, but that would never happen because they run forever

Signed-off-by: Anton Gilgur <[email protected]>

- it was running all the time before in `kit` and now `task`, but it should only run when there are dep changes

Signed-off-by: Anton Gilgur <[email protected]>