Reusable workflows for packaging and Poetry-CI

.github/workflows/packaging.yml

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+# Uses PyPA's build tool to build a wheel and sdist.
+# See https://packaging.python.org/en/latest/guides/distributing-packages-using-setuptools/#packaging-your-project
+
+name: Build packages for distribution
+on:
+  workflow_call:
+
+
+jobs:
+  packaging:
+    runs-on: ubuntu-latest
+    name: Packaging
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Setup Python
+        uses: actions/setup-python@v2
+
+      - name: Install tools
+        run: python -m pip install build twine
+
+      - name: Build wheel and sdist
+        run: python -m build
+
+      # This checks that the "long description" fields renders correctly on PyPI.
+      # We don't upload to PyPI, but the two steps below only upload artifacts to GitHub.
+      - name: Run twine check
+        run: python -m twine check dist/*
+
+      - uses: actions/upload-artifact@v2
+        with:
+          name: Wheel
+          path: dist/*.whl
+
+      - uses: actions/upload-artifact@v2
+        with:
+          name: Sdist
+          path: dist/*.tar.gz

.github/workflows/python-poetry-ci.yml

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+name: Linting
+on:
+  workflow_call:
+
+
+jobs:
+  style:
+    runs-on: ubuntu-latest
+
+    name: Style checks
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Setup Poetry
+        uses: matrix-org/setup-python-poetry@v1
+
+      - name: Import order (isort)
+        run: poetry run isort --check --diff .
+
+      - name: Code style (black)
+        run: poetry run black --check .
+
+      - name: Semantic checks (flake8)
+        run: poetry run flake8
+
+  mypy:
+    runs-on: ubuntu-latest
+    name: Typechecking
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Setup Poetry
+        uses: matrix-org/setup-python-poetry@v1
+
+      - name: Restore/persist mypy's cache
+        uses: AustinScola/mypy-cache-github-action@v1
+
+      - name: Run mypy
+        run: poetry run mypy

.gitignore

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+.idea

README.md

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+This repository contains [reusable workflows](https://docs.github.com/en/actions/using-workflows/reusing-workflows) for use by the [Synapse team](https://github.com/orgs/matrix-org/teams/synapse-core).
+
+The intent is to keep our various projects' CI configuration consistent without having to update N yaml files across N repositories.