ci: Lint GitHub Actions workflows with actionlint (#34729)

Added [rhysd/actionlint](https://github.com/rhysd/actionlint/) a static
checker for GitHub Actions workflow files.
Install locally with `brew install actionlint` the run with
`actionlint`.

Inspired by: https://github.com/zed-industries/zed/pull/34704 which
yielded this observation:

> In github actions: 
> 1. strings are truthy
> 2. `${{ }}` will become a string if it doesn't wrap the whole value.
>
> So `if: false && true` becomes `false`
> and `if: ${{ false && true }}` becomes `false`
> but `if: false && ${{ true }}` becomes `"false && true"` which
evaluates true
> The reason you sometimes need `${{ }}` is because YAML doesn't like
`!`
> so `if: !false` is invalid yaml
> and `if: ${{ !false }}` works just fine.

Changes:
- Add `actionlint` job
- Refactor `job_spec` job to be more readable
- Fix all `actionlint` and `shellcheck` errors in Actions workflows (62
in all)
- Add `self-mini-macos` and `self-32vcpu-windows-2022` labels to
self-hosted runners. Not strictly related, but useful if you need to
take a runner out of the rotation (since `macOS`, `self-hosted`, and
`ARM64` are auto-set and cannot be added/removed).
- Change ci.yml macos_relase to target `self-mini-macos` instead of
`bundle` which was previously deprecated.

This would've caught the error fixed in
https://github.com/zed-industries/zed/pull/34704. Here's what that [job
failure](https://github.com/zed-industries/zed/actions/runs/16376993944/job/46279281842?pr=34729)
would've looked like.

Release Notes:

- N/A

.github/workflows/bump_patch_version.yml

@@ -28,7 +28,7 @@ jobs:
         run: |
           set -eux
 
-          channel=$(cat crates/zed/RELEASE_CHANNEL)
+          channel="$(cat crates/zed/RELEASE_CHANNEL)"
 
           tag_suffix=""
           case $channel in
@@ -43,9 +43,9 @@ jobs:
               ;;
           esac
           which cargo-set-version > /dev/null || cargo install cargo-edit
-          output=$(cargo set-version -p zed --bump patch 2>&1 | sed 's/.* //')
+          output="$(cargo set-version -p zed --bump patch 2>&1 | sed 's/.* //')"
           export GIT_COMMITTER_NAME="Zed Bot"
           export GIT_COMMITTER_EMAIL="hi@zed.dev"
           git commit -am "Bump to $output for @$GITHUB_ACTOR" --author "Zed Bot <hi@zed.dev>"
-          git tag v${output}${tag_suffix}
-          git push origin HEAD v${output}${tag_suffix}
+          git tag "v${output}${tag_suffix}"
+          git push origin HEAD "v${output}${tag_suffix}"