Weekly Preview Fix (#9075)

### Description

The `weekly-preview.yml` action is not working due to some strange
interaction with the updated build process. The solution is to install
MONAI first before making the wheel.

### Types of changes
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [x] Non-breaking change (fix or new feature that would not break
existing functionality).
- [ ] Breaking change (fix or new feature that would cause existing
functionality to change).
- [ ] New tests added to cover the changes.
- [ ] Integration tests passed locally by running `./runtests.sh -f -u
--net --coverage`.
- [ ] Quick tests passed locally by running `./runtests.sh --quick
--unittests --disttests`.
- [ ] In-line docstrings updated.
- [ ] Documentation updated, tested `make html` command in the `docs/`
folder.

---------

Signed-off-by: Eric Kerfoot <17726042+ericspod@users.noreply.github.com>

Author: ericspod

.github/workflows/weekly-preview.yml

@@ -6,9 +6,18 @@ permissions:
 on:
   schedule:
   - cron: "0 2 * * 0"  # 02:00 of every Sunday
+  pull_request:
+    branches:
+      - dev
+
+env:
+  PYTHON_VER: '3.10'
+  PYTORCH_VER: '2.8.0'
+  PIP_EXTRA_INDEX_URL: "https://download.pytorch.org/whl/cpu"  # forces CPU PyTorch installation, should be faster
 
 jobs:
   static-checks:
+    if: github.event_name == 'schedule'  # only check on cron run, these checks are redundant in a PR
     runs-on: ubuntu-latest
     strategy:
       matrix:
@@ -25,10 +34,10 @@ jobs:
     - uses: actions/checkout@v7
       with:
         persist-credentials: false
-    - name: Set up Python 3.10
+    - name: Set up Python ${{ env.PYTHON_VER }}
       uses: actions/setup-python@v6
       with:
-        python-version: '3.10'
+        python-version: ${{ env.PYTHON_VER }}
         cache: 'pip'
     - name: Install dependencies
       run: |
@@ -40,22 +49,24 @@ jobs:
         $(pwd)/runtests.sh --build --clean
         $(pwd)/runtests.sh --build --${{ matrix.opt }}
 
-  packaging:
+  publish:
     if: github.repository == 'Project-MONAI/MONAI'
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v7
       with:
-        ref: dev
+        # get the ref for the PR branch or dev if this is a cron job
+        ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || 'dev' }}
         fetch-depth: 0
         persist-credentials: false
-    - name: Set up Python 3.10
+    - name: Set up Python ${{ env.PYTHON_VER }}
       uses: actions/setup-python@v6
       with:
-        python-version: '3.10'
-    - name: Install setuptools
+        python-version: ${{ env.PYTHON_VER }}
+        cache: 'pip'
+    - name: Install tools
       run: |
-        python -m pip install --user --upgrade setuptools wheel packaging
+        python -m pip install -U pip build
     - name: Build distribution
       run: |
         export HEAD_COMMIT_ID=$(git rev-parse HEAD)
@@ -72,9 +83,15 @@ jobs:
         git tag "1.7.dev${YEAR_WEEK}"
         git log -1
         git tag --list
-        python setup.py sdist bdist_wheel
-
+        python -m build
+        ls -lh dist
+    - name: Test Installation
+      run: |
+        pip install dist/*.whl
+        pip list
+        (cd "$(mktemp -d)" && python -c 'import monai; print(monai.__version__)')
     - name: Publish to PyPI
+      if: github.event_name == 'schedule'  # only publish on cron run
       uses: pypa/gh-action-pypi-publish@release/v1
       with:
         user: __token__