ci: temporarily remove ubuntu and lets debug this

.gitea/workflows/nixtest.yaml

@@ -6,12 +6,13 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        os: [ubuntu-latest, nix-runner]
+        os: [nix-runner]
     runs-on: ${{ matrix.os }}
     steps:
       - run: echo "🎉 The job was automatically triggered by a ${{ gitea.event_name }} event."
       - run: echo "🐧 This job is now running on a ${{ runner.os }} server hosted by Gitea!"
       - run: echo "🔎 The name of your branch is ${{ gitea.ref }} and your repository is ${{ gitea.repository }}."
+      - run: whoami
       - name: Check out repository code
         uses: actions/checkout@v4
       - name: Install SSH keys