was this the problem

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Install nix
-        uses: cachix/install-nix-action@v16
+        uses: cachix/install-nix-action@v27
 
       - name: Login to tailscale
         uses: tailscale/github-action@v3.2.3
@@ -23,7 +23,7 @@ jobs:
           tags: tag:ci
 
       - name: Setup Attic cache
-        uses: ryanccn/attic-action@v0
+        uses: ryanccn/attic-action@v0.3.1
         with:
           endpoint: http://wallfacer.curl-boga.ts.net:7080
           cache: main