Remove useless CI

.github/workflows/coverage.yml

@@ -1,33 +0,0 @@
----
-on:
-  workflow_dispatch:
-
-name: Execute code coverage
-
-jobs:
-  nightly-coverage:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: nightly
-          override: true
-      - uses: actions-rs/cargo@v1
-        with:
-          command: clean
-      - uses: actions-rs/cargo@v1
-        with:
-          command: test
-          args: --all-features --no-fail-fast
-        env:
-          CARGO_INCREMENTAL: "0"
-          RUSTFLAGS: "-Zprofile -Ccodegen-units=1 -Cinline-threshold=0 -Clink-dead-code -Coverflow-checks=off -Cpanic=unwind -Zpanic_abort_tests"
-      - uses: actions-rs/grcov@v0.1
-      - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v3
-        with:
-          token: ${{ secrets.CODECOV_TOKEN }}
-          file: ${{ steps.coverage.outputs.report }}
-          yml: ./codecov.yml
-          fail_ci_if_error: true