build: add release-please workflow

Author: danielknell

.github/workflows/release-please.yml

@@ -0,0 +1,74 @@
+name: Release
+
+on:
+  push:
+    branches:
+      - "main"
+
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    env:
+      PACKAGE_NAME: "conjecture"
+    steps:
+    - name: release please
+      uses: google-github-actions/release-please-action@v3
+      id: release
+      with:
+        release-type: python
+        package-name: ${{ env.PACKAGE_NAME }}
+
+    - uses: actions/checkout@v2
+      if: ${{ steps.release.outputs.release_created }}
+
+    - name: set python version
+      if: ${{ steps.release.outputs.release_created }}
+      uses: actions/setup-python@v1
+      with:
+        python-version: "3.10"
+
+    - name: install poetry
+      if: ${{ steps.release.outputs.release_created }}
+      run: |
+        curl -sSL https://install.python-poetry.org | python - --preview
+        
+    - name: Update PATH
+      if: ${{ steps.release.outputs.release_created }}
+      run: echo "$HOME/.local/bin" >> $GITHUB_PATH
+
+    - name: configure poetry
+      if: ${{ steps.release.outputs.release_created }}
+      run: poetry config virtualenvs.in-project true
+
+    - name: set up python cache
+      if: ${{ steps.release.outputs.release_created }}
+      uses: actions/cache@v2
+      id: python-cache
+      with:
+        path: .venv
+        key: venv-${{ hashFiles('**/poetry.lock') }}
+      
+    - name: ensure cache is healthy
+      if: ${{ steps.python-cache.outputs.cache-hit == 'true' && steps.release.outputs.release_created }}
+      run: timeout 10s poetry run pip --version || rm -rf .venv
+    
+    - name: install python dependencies
+      if: ${{ steps.python-cache.outputs.cache-hit != 'true' && steps.release.outputs.release_created }}
+      run: poetry install
+
+    - name: build release
+      if: ${{ steps.release.outputs.release_created }}
+      run: poetry build
+      
+    - name: upload assets
+      uses: softprops/action-gh-release@v1
+      if: ${{ steps.release.outputs.release_created }}
+      with:
+        tag_name: ${{ steps.release.outputs.tag_name }}
+        files: dist/*
+
+    - name: publish release
+      if: ${{ steps.release.outputs.release_created }}
+      run: poetry publish
+      env:
+        POETRY_PYPI_TOKEN_PYPI: ${{ secrets.PYPI_AUTH_TOKEN }}