use ${{ env.API_CRATES }} when all crates will have example

[github-actions[bot]]

https://api.github.com/boozook/playdate/blob/1f1bc30b267d3d2e1f0abd8dd49c8a144e6c03b5/.github/workflows/tests.yml#L353

        run: |
          FEATURES=bindgen-runtime,bindings-derive-debug

          # TODO: use ${{ env.API_CRATES }} when all crates will have example
          cargo playdate package --simulator --device -p=playdate-sys --examples --features=$FEATURES
          cargo playdate package --simulator --device -p=playdate-fs --examples --features=$FEATURES
          cargo playdate package --simulator --device -p=playdate-controls --examples --features=$FEATURES