CI: Install fish & zsh

Author: adaszko

.github/workflows/test.yml

@@ -28,4 +28,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
+    - run: sudo add-apt-repository ppa:fish-shell/release-4
+    - run: sudo apt update
+    - run: sudo apt install -y fish zsh
     - run: ./run-e2e-tests.bash