Add github workflow

.github/workflows/main.yml

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+name: octoDNS Kubernetes
+on: [pull_request]
+
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        # Tested versions based on dates in https://devguide.python.org/devcycle/#end-of-life-branches
+        python-version: ['3.7', '3.8', '3.9', '3.10']
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup python
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+          architecture: x64
+      - name: CI Build
+        run: |
+          ./script/cibuild-template
+  setup-py:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup python
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.10'
+          architecture: x64
+      - name: CI setup.py
+        run: |
+          ./script/cibuild-setup-py-template

.github/workflows/stale.yml

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+name: 'Close stale issues and PRs'
+on:
+  schedule:
+    - cron: '42 4 * * *'
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v4
+        with:
+          stale-issue-message: 'This issue is stale because it has been open 90 days with no activity. Remove stale label or comment or this will be closed in 7 days.'
+          days-before-stale: 90
+          days-before-close: 7