chore: conf 2nd invocation

Author: samrose

.github/workflows/test.yml

@@ -44,9 +44,14 @@ jobs:
       POSTGRES_PORT: 5478
       POSTGRES_PASSWORD: password
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: DeterminateSystems/nix-installer-action@main
+        with:
+          extra-conf: |
+            substituters = https://cache.nixos.org https://nix-postgres-artifacts.s3.amazonaws.com
+            trusted-public-keys = nix-postgres-artifacts:dGZlQOvKcNEjvT7QEAJbcV6b6uk7VF/hWMjhYleiaLI=% cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
+
 
       - name: Set PostgreSQL version environment variable
         run: echo "POSTGRES_MAJOR_VERSION=${{ matrix.postgres_version }}" >> $GITHUB_ENV