#111 perf: unify cargo cache key across all CI jobs

Author: RAprogramm

.github/workflows/reusable-ci.yml

@@ -225,7 +225,7 @@ jobs:
       - name: Cache cargo
         uses: Swatinem/rust-cache@v2
         with:
-          shared-key: "coverage"
+          shared-key: "stable"
           save-if: ${{ github.ref == 'refs/heads/main' }}
 
       - name: Install cargo-llvm-cov