Enhance CI workflow by adding --quiet flag to Nix build commands for reduced output during scheme builds and cache pushes.

.github/workflows/build-schemes.yml

@@ -58,7 +58,8 @@ jobs:
           # Build the configuration
           echo "Building $scheme..."
           nix build .#nixosConfigurations.${HOSTNAME}.config.system.build.toplevel \
-            --out-link ./result-$scheme
+            --out-link ./result-$scheme \
+            --quiet
           
           # Push to cache
           echo "Pushing $scheme to cache..."
@@ -66,7 +67,8 @@ jobs:
           
           # Also push using print-out-paths for better cache coverage
           nix build .#nixosConfigurations.${HOSTNAME}.config.system.build.toplevel \
-            --print-out-paths | attic push servidos:nixos --stdin
+            --print-out-paths \
+            --quiet | attic push servidos:nixos --stdin
           
           echo "✓ Completed $scheme"
           echo ""