chore: add github actions workflow

Refs: #8

.github/workflows/ci.yml

@@ -0,0 +1,71 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    # run CI only if files in these whitelisted paths are changed
+    paths:
+      - '.github/workflows/**'
+      - 'rdmo_plugins/**'
+      - .pre-commit-config.yaml
+      - pyproject.toml
+
+# Ref: https://docs.github.com/en/actions/using-jobs/using-concurrency
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  PYTHONDONTWRITEBYTECODE: 1
+  FORCE_COLOR: 1 # colored output by pytest etc.
+  CLICOLOR_FORCE: 1 # colored output by ruff
+
+jobs:
+
+  lint:
+    name: Lint
+    runs-on: ubuntu-22.04
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-python@v4
+      with:
+        python-version: "3.12"
+        cache: pip
+    - run: python -m pip install --upgrade pip setuptools wheel
+    - run: python -m pip install -e .[dev]
+    - name: Set up pre-commit cache
+      uses: actions/cache@v3
+      with:
+        path: ~/.cache/pre-commit
+        key: lint-${{ hashFiles('.pre-commit-config.yaml') }}
+    - name: Run linters via pre-commit (ruff, eslint)
+      run: pre-commit run --all-files --color=always
+
+  dev-setup:
+    # Ref: structlog (MIT licensed) <https://github.com/hynek/structlog/blob/main/.github/workflows/ci.yml>
+    name: "Test dev setup on ${{ matrix.os }}"
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v4
+        with:
+          python-version: "3.12"
+          cache: pip
+      - run: python -Im pip install -e .[dev]
+      - run: python -Ic 'import rdmo_plugins; print(rdmo_plugins.__version__)'
+
+  required-checks-pass:
+    if: always()
+    needs:
+      - lint
+      - dev-setup
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: re-actors/alls-green@release/v1
+        with:
+          jobs: ${{ toJSON(needs) }}