Fix download Nixpkgs tarball

.gitea/workflows/trigger_devbox.yaml

@@ -9,22 +9,27 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - uses: DeterminateSystems/nix-installer-action@dea7810afd9d4c98556c8ec68cf361bd5b648eaa
+      - name: Download Nixpkgs Tarball
+        run: |
+          wget -O nixpkgs.tar.gz https://github.com/NixOS/nixpkgs/archive/75a52265bda7fd25e06e3a67dee3f0354e73243c.tar.gz
+
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@e50d5f73bfe71c2dd0aa4218de8f4afa59f8f81d  # v16
         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
+            experimental-features = ca-derivations fetch-closure flakes nix-command
+            substituters = https://cache.nixos.org/
+            trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
 
       - name: Install devbox
         uses: jetify-com/devbox-install-action@v0.12.0
         with:
           project-path: './src'
           enable-cache: true
-          devbox-version: 0.13.4
+          devbox-version: 0.13.7
           skip-nix-installation: true
+          nixpkgs-url: file://$(pwd)/nixpkgs.tar.gz
 
       - name: Run arbitrary commands
         run: devbox run -- echo "done"