Add initial version of publish workflow

.github/workflows/publish.yml

@@ -0,0 +1,72 @@
+name: Build & publish to PyPI
+
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    tags:
+      - "v[0-9]+.[0-9]+.[0-9]+*"
+
+concurrency:
+  group: "${{ github.workflow }}-${{ github.ref }}"
+  cancel-in-progress: true
+
+jobs:
+  pypi-publish:
+    if: github.ref_type == 'tag'
+    name: Publish release to PyPI
+    runs-on: ubuntu-latest
+    environment:
+      name: PyPI
+      url: https://pypi.org/p/nsidc-metgenc
+    permissions:
+      id-token: write
+      attestations: write
+      contents: read
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: 3.12
+
+      - name: cache poetry install
+        uses: actions/cache@v4
+        with:
+          path: ~/.local
+          key: poetry-1.8.3-0
+
+      - uses: snok/install-poetry@v1
+        with:
+          version: 1.8.3
+          virtualenvs-create: true
+          virtualenvs-in-project: true
+
+      - name: cache deps
+        id: cache-deps
+        uses: actions/cache@v4
+        with:
+          path: .venv
+          key: pydeps-${{ hashFiles('**/poetry.lock') }}
+
+      - run: poetry install --no-interaction --no-root
+        if: steps.cache-deps.outputs.cache-hit != 'true'
+
+      - run: poetry install --no-interaction
+
+      - run: poetry build
+
+      - run: poetry publish
+
+      - uses: actions/download-artifact@v4
+        with:
+          name: Packages
+          path: dist
+
+      - name: Generate artifact attestation for sdist and wheel
+        uses: actions/attest-build-provenance@v1.4.3
+        with:
+          subject-path: "dist/*"
+
+    - name: Publish package distributions to PyPI
+      uses: pypa/gh-action-pypi-publish@release/v1