[Pypi] Automatically release nightly version of skypilot

.github/workflows/pypi-nightly-build.yml

@@ -0,0 +1,64 @@
+name: pypi-publish-nightly
+on:
+  schedule:
+    - cron: '35 10 * * *' # 10:35am UTC, 2:35am PST, 5:35am EST
+  workflow_dispatch:
+
+jobs:
+  # nightly release check from https://stackoverflow.com/a/67527144
+  check-date:
+    runs-on: ubuntu-latest
+    outputs:
+      should_run: ${{ steps.should_run.outputs.should_run }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: print latest_commit
+        run: echo ${{ github.sha }}
+      - id: should_run
+        continue-on-error: true
+        name: check latest commit is less than a day
+        if: ${{ github.event_name == 'schedule' }}
+        run: test -z $(git rev-list  --after="24 hours"  ${{ github.sha }}) && echo "::set-output name=should_run::false"
+
+  nightly-build-pypi:
+    runs-on: ubuntu-latest
+    needs: check-date
+    if: ${{ needs.check_date.outputs.should_run != 'false' }}
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v3
+      - name: Set up Python 3.10
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.10'
+          cache: 'pip' # caching pip dependencies
+      - name: Install pypa/build
+        run: >-
+          python -m
+          pip install
+          build
+          --user
+      - name: Set release version
+        run: |
+          RELEASE_VERSION=$(date +%Y%m%d)
+          sed -i "s/{{SKYPILOT_COMMIT_SHA}}/${{ github.sha }}/g" sky/__init__.py
+          sed -i "s/__version__ = '.*'/__version__ = '1.0.0-dev${RELEASE_VERSION}'/g" sky/__init__.py
+          sed -i "s/name='skypilot',/name='skypilot-nightly',/g" sky/setup_files/setup.py
+      - name: Build a binary wheel and a source tarball
+        run: >-
+          python -m
+          build
+          --sdist
+          --wheel
+          --outdir dist/
+          .
+      - name: Publish distribution to Test PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          password: ${{ secrets.TEST_PYPI_API_TOKEN }}
+          repository-url: https://test.pypi.org/legacy/
+      - name: Publish distribution to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          password: ${{ secrets.PYPI_API_TOKEN }}
+