CI: GitHub: Proper flake check

Author: Sukant Hajra

Diff for: .github/workflows/ci.yml

@@ -18,4 +18,4 @@ jobs:
     - uses: DeterminateSystems/magic-nix-cache-action@main
     - run: cat /etc/nix/nix.conf
     - run: cat ~/.config/nix/nix.conf
-    - run: nix --print-build-logs build --print-out-paths .#ci
+    - run: nix --print-build-logs flake check --verbose

Diff for: flake.nix

@@ -100,7 +100,6 @@
                     packages.licenses-thirdparty =
                         build.shajra-keyboards-licenses;
                     checks.ci = build.shajra-keyboards-ci;
-                    legacyPackages.ci = build.shajra-keyboards-ci;
                     legacyPackages.nixpkgs = build;
                     apps = rec {
                         default = licenses-thirdparty;