temporarily remove ci workflow

.github/workflows/ci.yml

@@ -1,28 +0,0 @@
-on: [pull_request]
-
-name: CI
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
-
-env:
-  RUST_BACKTRACE: 1
-
-jobs:
-  build-fmt-clippy-test:
-    name: fmt, clippy, test --release
-    runs-on: [self-hosted, i5-4690K]
-    timeout-minutes: 90
-    env:
-      FORCE_COLOR: 1
-    steps:
-      - uses: actions/checkout@v2
-        with:
-          clean: "true"
-
-      - name: Earthly version
-        run: earthly --version
-
-      - name: install dependencies, build, run zig tests, rustfmt, clippy, cargo test --release
-        run: ./ci/safe-earthly.sh +test-all