Run tests during CI, uses the make test command

.github/workflows/test.yaml

@@ -1,13 +1,20 @@
-name: "Test"
+name: "CI pipeline"
 on:
   push:
 jobs:
-  tests:
+  check_nix:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
     - uses: cachix/install-nix-action@v22
       with:
         nix_path: nixpkgs=channel:nixos-unstable
     - uses: DeterminateSystems/magic-nix-cache-action@v2
+    - name: run "nix-shell"
     - run: nix-shell
+
+  test-suite:
+    runs-on: ubuntu-latest
+    needs: check-nix
+    steps:
+      - run: make test