refactor(workflow): rename 'build' job to 'package' and update corres…

…ponding commands

- Renamed the 'build' job to 'package' for better clarity.
- Updated the command from 'just build' to 'just package' to reflect the job name change.

.github/workflows/flake.yaml

@@ -28,7 +28,7 @@ jobs:
       - uses: actions/checkout@v4
       - run: nix develop -c just check
 
-  build:
+  package:
     needs:
       - check
     strategy:
@@ -49,4 +49,4 @@ jobs:
           authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
           name: ${{ env.CACHIX_BINARY_CACHE }}
       - uses: actions/checkout@v4
-      - run: nix develop -c just build "${{ matrix.profile }}"
+      - run: nix develop -c just package "${{ matrix.profile }}"