refactor: remove unnecesary nixos gh workflow

#452 (comment)

Author: Chemaclass

.github/workflows/tests.yml

@@ -118,17 +118,3 @@ jobs:
       - name: Run Tests
         run: |
           ./bashunit --parallel tests/
-
-  nixos:
-    name: "NixOS"
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-        with:
-          fetch-depth: 1
-
-      - name: Run Tests
-        run: |
-          docker run --rm -v "$(pwd)":/project -w /project nixos/nix:latest \
-            nix-shell -p bash --run "./bashunit --simple tests/"