Remove gh actions

.github/workflows/ci.yaml

@@ -1,19 +0,0 @@
-name: "CI"
-on:
-  # Run only when pushing to master branch, and making PRs
-  push:
-    branches:
-      - main
-  pull_request:
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-      - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@main
-      - uses: cachix/cachix-action@v12
-        with:
-          name: srid
-      - name: Build 🔨
-        run: nix run github:srid/nixci