Actions: Remove --no-index from Wheel test build command (#424)

This is a fix for:


https://github.com/MHKiT-Software/MHKiT-Python/actions/runs/18594536347/job/53017269068#step:6:14

```
Run pip install 'mhkit[all]' --no-index --find-links dist/
Looking in links: dist/
Processing ./dist/mhkit-1.0.1-py3-none-any.whl
INFO: pip is looking at multiple versions of mhkit[all] to determine which version is compatible with other requirements. This could take a while.
ERROR: Could not find a version that satisfies the requirement numpy>=2.0.0 (from mhkit[all]) (from versions: none)
ERROR: No matching distribution found for numpy>=2.0.0
Error: Process completed with exit code 1.
```

This fix removes `--no-index` which caused pip to only use local
packages, which causes the above failure for any/all external
packages/modules.

Author: simmsa

.github/workflows/pypi.yml

@@ -29,7 +29,11 @@ jobs:
 
       - name: Test wheel contents before upload
         run: |
-          pip install 'mhkit[all]' --no-index --find-links dist/
+          # Install the built wheel from dist/ to verify it was packaged correctly before upload
+          # --find-links dist/ tells pip to look in dist/ directory first and prefer the wheel
+          # Dependencies (numpy, pandas, etc.) are fetched from PyPI as normal
+          # This verifies the wheel contains all necessary files and can be installed successfully
+          pip install 'mhkit[all]' --find-links dist/
           python -c "from mhkit import wave, river, tidal, dolfyn, power, loads, mooring, acoustics, qc, utils; print('All modules imported successfully')"
 
       - name: Upload to Test PyPI

.github/workflows/test-wheel-build.yml

@@ -0,0 +1,43 @@
+# Tests that the package can be built and installed from a wheel
+# Runs on PRs to catch build issues before merging to main
+# Does NOT publish to PyPI
+
+name: Test PIP Package Build
+
+on:
+  pull_request:
+    branches:
+      - main
+      - develop
+
+jobs:
+  test-build:
+    name: Test wheel build
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.10', '3.11', '3.12']
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install build tools
+        run: python -m pip install build --user
+
+      - name: Build wheel and source distribution
+        run: python -m build --sdist --wheel --outdir dist/ .
+
+      - name: Test wheel installation
+        run: |
+          # Install the built wheel from dist/ to verify it was packaged correctly
+          # --find-links dist/ tells pip to look in dist/ directory first and prefer the wheel
+          # Dependencies (numpy, pandas, etc.) are fetched from PyPI as normal
+          # This verifies the wheel contains all necessary files and can be installed successfully
+          pip install 'mhkit[all]' --find-links dist/
+          python -c "from mhkit import wave, river, tidal, dolfyn, power, loads, mooring, acoustics, qc, utils; print('All modules imported successfully')"