ci: add workflow for releases (#3018)

GitHub Actions workflow to create a release: will upload to PyPI
and create a GitHub release with the `sdist` and `bdist_wheel`
as well.

The version code is switched to `setuptools_scm` to work well
with this flow (e.g. avoid needing to write a script that does
a `sed` on the version file and commits as part of release).

Signed-off-by: Milas Bowman <milas.bowman@docker.com>

2 files changed, 47 insertions, 0 deletions

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 296bf0d..d163412 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -2,6 +2,9 @@ name: Python package
 
 on: [push, pull_request]
 
+env:
+  DOCKER_BUILDKIT: '1'
+
 jobs:
     flake8:
         runs-on: ubuntu-latest
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..50695b1
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,44 @@
+name: Release
+
+on:
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: "Release Tag WITHOUT `v` Prefix (e.g. 6.0.0)"
+        required: true
+      dry-run:
+        description: 'Dry run'
+        required: false
+        type: boolean
+        default: true
+
+jobs:
+  publish:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '3.10'
+
+      - run: python setup.py sdist bdist_wheel
+        env:
+          SETUPTOOLS_SCM_PRETEND_VERSION_FOR_DOCKER: ${{ inputs.tag }}
+
+      - name: Publish to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        if: ! inputs.dry-run
+        with:
+          password: ${{ secrets.PYPI_API_TOKEN }}
+
+      - name: Create GitHub release
+        uses: ncipollo/release-action@v1
+        if: ! inputs.dry-run
+        with:
+          artifacts: "dist/*"
+          generateReleaseNotes: true
+          draft: true
+          commit: ${{ github.sha }}
+          token: ${{ secrets.GITHUB_TOKEN }}
+          tag: ${{ inputs.tag }}