fix(ci): repair publish workflows (#39)

## Summary
- build Python wheels with `maturin build` to produce manylinux-tagged
artifacts
- publish `lance-context-core` and `lance-context` in separate steps to
avoid re-publishing the core crate
- add a short wait to let crates.io index update before publishing the
wrapper crate

## Testing
- Not run (CI workflow changes only)

Author: beinan

.github/workflows/python-publish.yml

@@ -59,7 +59,7 @@ jobs:
       - name: Build distributions
         working-directory: python
         run: |
-          uv build --sdist --wheel --out-dir dist
+          maturin build --release --out dist --sdist
 
       - name: Upload distributions
         uses: actions/upload-artifact@v4

.github/workflows/rust-publish.yml

@@ -27,6 +27,7 @@ env:
 
 jobs:
   publish:
+    if: github.event_name != 'pull_request'
     runs-on: ubuntu-24.04
     timeout-minutes: 60
     steps:
@@ -46,9 +47,25 @@ jobs:
 
       - uses: rui314/setup-mold@v1
 
-      - uses: katyo/publish-crates@v2
+      - name: Publish lance-context-core
+        uses: katyo/publish-crates@v2
         with:
           registry-token: ${{ secrets.CARGO_REGISTRY_TOKEN }}
-          args: "-p lance-context-core -p lance-context --all-features"
-          path: .
+          args: "--all-features"
+          path: crates/lance-context-core
+          dry-run: ${{ github.event_name == 'pull_request' || (github.event_name == 'workflow_dispatch' && github.event.inputs.mode == 'dry_run') }}
+
+      - name: Wait for crates.io index
+        if: >
+          (github.event_name == 'release' && github.event.action == 'released') ||
+          (github.event_name == 'workflow_dispatch' && github.event.inputs.mode == 'release')
+        run: |
+          sleep 30
+
+      - name: Publish lance-context
+        uses: katyo/publish-crates@v2
+        with:
+          registry-token: ${{ secrets.CARGO_REGISTRY_TOKEN }}
+          args: "--all-features"
+          path: crates/lance-context
           dry-run: ${{ github.event_name == 'pull_request' || (github.event_name == 'workflow_dispatch' && github.event.inputs.mode == 'dry_run') }}