Add nix installer action

.gitea/workflows/trigger_devbox.yaml

@@ -9,12 +9,22 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
+      - uses: DeterminateSystems/nix-installer-action@dea7810afd9d4c98556c8ec68cf361bd5b648eaa
+        with:
+          logger: pretty
+          # pin installer version as v0.33 and v0.34 break our devbox setup
+          source-tag: v0.32.3
+          extra-conf: |
+            experimental-features = ca-derivations fetch-closure
+          # flakes nix-command
+
       - name: Install devbox
         uses: jetify-com/devbox-install-action@v0.12.0
         with:
           project-path: './src'
           enable-cache: true
           devbox-version: 0.13.4
+          skip-nix-installation: true
 
       - name: Run arbitrary commands
         run: devbox run -- echo "done"