ci: remove unused workflows

.github/workflows/build.yml

@@ -1,18 +0,0 @@
-name: "Build"
-on:
-  # curl -fsSL -XPOST \
-  #     -H "Accept: application/vnd.github.everest-preview+json" \
-  #     -H "Authorization: token $GITHUB_TOKEN" \
-  #     --data '{"event_type": "build", "client_payload": {"args": "-f channel:nixpkgs-unstable hello"}}' \
-  #     https://api.github.com/repos/LnL7/nix-darwin/dispatches
-  repository_dispatch:
-      types:
-        - build
-jobs:
-  build:
-    runs-on: macos-12
-    steps:
-    - uses: actions/checkout@v3
-    - uses: cachix/install-nix-action@v22
-    - run: |
-        nix build ${{ github.event.client_payload.args }} -vL

.github/workflows/debug.yml

@@ -1,23 +0,0 @@
-name: "Debug"
-on:
-  # curl -fsSL -XPOST \
-  #     -H "Accept: application/vnd.github.everest-preview+json" \
-  #     -H "Authorization: token $GITHUB_TOKEN" \
-  #     --data '{"event_type": "debug"}' \
-  #     https://api.github.com/repos/LnL7/nix-darwin/dispatches
-  repository_dispatch:
-      types:
-        - debug
-jobs:
-  debug:
-    runs-on: macos-12
-    steps:
-    - uses: actions/checkout@v3
-    - uses: cachix/install-nix-action@v22
-    - run: |
-        nix-channel --add https://nixos.org/channels/nixpkgs-unstable nixpkgs
-        nix-channel --update
-    - run: |
-        nix-shell -A installer
-        nix-shell -A installer.check
-    - uses: mxschmitt/action-tmate@v3