fix nightly again (#2195)

This PR moves nightly back to GH with Ubuntu 24.04 and the old settings.
The nightly test passed for this branch in here:
https://github.com/powdr-labs/powdr/actions/runs/12154934614

.github/workflows/nightly-tests.yml

@@ -43,25 +43,22 @@ jobs:
           args: '--all-targets'
 
   test_release:
-    runs-on: warp-ubuntu-2404-x64-4x
+    runs-on: ubuntu-24.04
     needs: check_if_needs_running
     if: needs.check_if_needs_running.outputs.status > 0
 
     steps:
     - uses: actions/checkout@v4
       with:
         submodules: recursive
-    - name: ⚡ Restore rust cache
-      id: cache
-      uses: WarpBuilds/cache/restore@v1
+    - name: ⚡ Cache rust
+      uses: actions/cache@v4
       with:
         path: |
-          ~/.cargo/registry/index/
-          ~/.cargo/registry/cache/
-          ~/.cargo/git/db/
-          target/
-          Cargo.lock
-        key: ${{ runner.os }}-cargo-nightly-tests
+          ~/.cargo/registry
+          ~/.cargo/git
+          target
+        key: ${{ runner.os }}-cargo-release-${{ hashFiles('**/Cargo.toml') }}
     - name: ⚡ Cache nodejs
       uses: actions/cache@v4
       with:
@@ -87,6 +84,7 @@ jobs:
     - name: Build
       run: cargo build --all --release --all-features
     - name: Run tests
-      run: PILCOM=$(pwd)/pilcom/ cargo test --all --release --verbose --all-features -- --include-ignored --nocapture
+      # Number threads is set to 1 because the runner does not have enough memeory for more.
+      run: PILCOM=$(pwd)/pilcom/ cargo test --all --release --verbose --all-features -- --include-ignored --nocapture --test-threads=1
     - name: Run benchmarks
       run: cargo bench --workspace --all-features