Merge #4453

4453: Don't test on nightly r=dureuill a=dureuill

# Pull Request

## Related issue
Fixes #4441 better 😅 

## What does this PR do?
- No longer run tests on nightly

The motivation for this change is that we are now updating Rust at fixed points in time, and so no longer need nightly runs to ensure that a change won't get into stable and break our build at the worst possible moment.


Co-authored-by: Louis Dureuil <louis@meilisearch.com>

.github/workflows/test-suite.yml

@@ -31,17 +31,10 @@ jobs:
           apt-get update && apt-get install -y curl
           apt-get install build-essential -y
       - name: Setup test with Rust stable
-        if: github.event_name != 'schedule'
         uses: actions-rs/toolchain@v1
         with:
           toolchain: stable
           override: true
-      - name: Setup test with Rust nightly
-        if: github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
-        uses: actions-rs/toolchain@v1
-        with:
-          toolchain: nightly
-          override: true
       - name: Cache dependencies
         uses: Swatinem/rust-cache@v2.7.1
       - name: Run cargo check without any default features