github/workflows: add release workflow (#47)

* github/workflows: add release workflow

Signed-off-by: William Woodruff <william@trailofbits.com>

* workflows/release: run on release publish events instead

Signed-off-by: William Woodruff <william@trailofbits.com>

* workflows/release: add signing

Dogfooding!

Signed-off-by: William Woodruff <william@trailofbits.com>

* Update .github/workflows/release.yml

Co-authored-by: Dustin Ingram <di@users.noreply.github.com>
Signed-off-by: William Woodruff <william@trailofbits.com>

* Update .github/workflows/release.yml

Co-authored-by: Dustin Ingram <di@users.noreply.github.com>
Signed-off-by: William Woodruff <william@trailofbits.com>

* workflows/release: use local sigstore version

Signed-off-by: William Woodruff <william@trailofbits.com>

* Update .github/workflows/release.yml

Co-authored-by: Dustin Ingram <di@users.noreply.github.com>
Signed-off-by: William Woodruff <william@trailofbits.com>

* workflows/release: set audience=sigstore for the JWT

Signed-off-by: William Woodruff <william@trailofbits.com>

* workflows/release: be careful about quotes

Signed-off-by: William Woodruff <william@trailofbits.com>

Co-authored-by: Dustin Ingram <di@users.noreply.github.com>

Author: woodruffw

.github/workflows/release.yml

@@ -0,0 +1,48 @@
+on:
+  release:
+    types:
+      - published
+
+name: release
+
+# Needed to access the workflow's OIDC identity.
+permissions:
+  id-token: write
+
+jobs:
+  pypi:
+    name: Build, sign and publish release to PyPI
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+
+    - uses: actions/setup-python@v2
+
+    - name: deps
+      run: python -m pip install -U build
+
+    - name: build
+      run: python -m build
+
+    - name: sign
+      run: |
+        # use the latest development changes for sigstore, at least
+        # until things are stabilized further
+        python -m pip install .
+
+        # retrieve the OIDC identity
+        identity_token=$( \
+          curl -H \
+            "Authorization: bearer $ACTIONS_ID_TOKEN_REQUEST_TOKEN" \
+            "$ACTIONS_ID_TOKEN_REQUEST_URL&audience=sigstore" \
+          | jq -r .value \
+        )
+
+        # sign all package distributions using the OIDC identity
+        python -m sigstore sign --identity-token=${identity_token} dist/*
+
+    - name: publish
+      uses: pypa/gh-action-pypi-publish@master
+      with:
+        user: __token__
+        password: ${{ secrets.PYPI_TOKEN }}