setup release process

.github/workflows/release.yml

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+name: Release on GitHub & PyPI
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - run: python -m pip install -U poetry
+      - run: poetry publish -u __token__ -p ${{ secrets.PYPI_TOKEN }} --build
+      - run: echo "TAG=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV
+      - run: gh release create -t "Release ${{ env.TAG}}" -n "$(awk '/## \[${{ env.TAG }}] - /{flag=1;next}/## \[/{flag=0}flag' CHANGELOG.md)" ${{ env.TAG }} dist/*
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

docs/release.md

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+# Publish a new release
+
+A github actions handle the build of the release archives, and push them to PyPI and Github Releases.
+To trigger it, we just need to:
+
+1. use poetry to update the version number
+2. update `__version__` in `cmw.py`
+3. update the changelog
+3. `git commit`
+4. `git tag`
+5. `git push`
+6. `git push --tags`
+
+
+For this, an helper script is provided:
+
+```bash
+./docs/release.sh [patch|minor|major|x.y.z]
+```

docs/release.sh

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+#!/bin/bash -eux
+# ./docs/release.sh [patch|minor|major|x.y.z]
+
+[[ $(basename "$PWD") == docs ]] && cd ..
+
+
+OLD=$(poetry version -s)
+
+poetry version "$1"
+
+NEW=$(poetry version -s)
+DATE=$(date +%Y-%m-%d)
+
+sed -ri "/__version__ /s/[0-9.]+/$NEW/" cmw.py
+sed -i "/^## \[Unreleased\]/a \\\n## [v$NEW] - $DATE" CHANGELOG.md
+sed -i "/^\[Unreleased\]/s/$OLD/$NEW/" CHANGELOG.md
+sed -i "/^\[Unreleased\]/a [v$NEW]: https://github.com/nim65s/cmw/compare/v$OLD...v$NEW" CHANGELOG.md
+
+git add cmw.py pyproject.toml CHANGELOG.md
+git commit -m "Release v$NEW"
+git tag -s "v$NEW" -m "Release v$NEW"
+git push
+git push --tags