Added a github CI workflow.

Author: coordt

.github/workflows/ci.yaml

@@ -0,0 +1,45 @@
+name: CI
+
+on:
+  - push
+  - pull_request
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+
+  tox:
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - ubuntu-latest
+          - windows-latest
+        python-version:
+          - "3.7"
+          - "3.8"
+          - "3.9"
+          - "3.10"
+          - "3.11"
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Check git is working
+        run: |
+          git config --global user.email "[email protected]"
+          git config --global user.name "Testing Git"
+          git --version
+          git config --list
+      - name: Check mercurial is working
+        run: |
+          echo -e '[ui]\nusername = Testing Mercurial<[email protected]>' > ~/.hgrc
+          hg --version
+      - name: Install test dependencies
+        run: pip install -r requirements/test.txt
+      - name: Test
+        run: pytest