Use custom verdi ci image

.github/workflows/ci.yml

@@ -8,15 +8,10 @@ jobs:
   test:
     name: Build and test
     runs-on: ubuntu-latest
+    container: ghcr.io/verdiwm/ci-image:latest
     steps:
       - uses: actions/checkout@v4
 
-      - name: Setup rust
-        run: rustup toolchain install stable --profile minimal
-
-      - name: Install nextest to run tests
-        uses: taiki-e/install-action@nextest
-
       - name: Run tests
         run: cargo nextest run --all-features