Add continuous integration workflow

.github/workflows/ci.yml

@@ -0,0 +1,64 @@
+name: Continuous Integration
+
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    branches:
+      - main
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  # Many color libraries just need this to be set to any value, but at least
+  # one distinguishes color depth, where "3" -> "256-bit color".
+  FORCE_COLOR: 3
+
+defaults:
+  run:
+    # Enables steps to see the micromamba environment:
+    shell: bash -leo pipefail {0}
+
+
+jobs:
+  checks:
+    name: Check Python ${{ matrix.python-version }} on ${{ matrix.runs-on }}
+    runs-on: ${{ matrix.runs-on }}
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.8"]
+        runs-on:
+          - ubuntu-latest
+          - macos-latest
+          # - windows-latest
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: mamba-org/setup-micromamba@v1
+        with:
+          micromamba-version: '1.5.6-0' # any version from https://github.com/mamba-org/micromamba-releases
+          environment-file: environment.yml
+          init-shell: >-
+            bash
+            powershell
+          cache-environment: true
+          post-cleanup: 'all'
+
+      - name: Type-check package
+        run: mypy
+
+      # - name: Test package
+      #   run: >-
+      #     python -m pytest -ra --cov --cov-report=xml --cov-report=term
+      #     --durations=20
+
+      # - name: Upload coverage report
+      #   uses: codecov/[email protected]
+      #   with:
+      #     token: ${{ secrets.CODECOV_TOKEN }}