Add CI workflow (#12)

.editorconfig

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+root = True
+
+[*]
+end_of_line = lf
+insert_final_newline = True
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = True
+
+[*.py]
+charset = utf-8
+
+[*.{yml,yaml,md,toml}]
+indent_size = 2
+
+[Makefile]
+indent_style = tab

.github/workflows/_ci.yaml

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+name: CI
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  workflow_dispatch:
+
+# https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#concurrency
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  lint:
+    name: Static analysis
+    uses: less-action/reusables/.github/workflows/pre-commit.yaml@main
+    with:
+      python-version: "3.10"

.pre-commit-config.yaml

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+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: "v4.3.0"
+    hooks:
+      - id: check-case-conflict
+      - id: check-merge-conflict
+      - id: end-of-file-fixer
+      - id: trailing-whitespace
+      - id: detect-private-key
+  - repo: https://github.com/editorconfig-checker/editorconfig-checker.python
+    rev: "2.6.1"
+    hooks:
+      - id: editorconfig-checker
+        alias: ec
+        args:
+          - -disable-indent-size
+  - repo: https://github.com/sirosen/check-jsonschema
+    rev: "0.18.3"
+    hooks:
+      - id: check-github-workflows