ci: add github actions CI

Preparation for open source.

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  make:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup Node
+        uses: actions/[email protected]
+        with:
+          node-version: 12
+
+      - name: Make
+        run: make
+
+  release:
+    needs: make
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup Node
+        uses: actions/[email protected]
+        with:
+          node-version: 12
+
+      - name: Run semantic-release
+        run: make semantic-release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}

Makefile

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+SHELL := /bin/bash
+
+.PHONY: all
+all: \
+	commitlint \
+	prettier-markdown \
+	git-verify-nodiff
+
+include tools/commitlint/rules.mk
+include tools/git-verify-nodiff/rules.mk
+include tools/prettier/rules.mk
+include tools/semantic-release/rules.mk