refactor: switch from release-please to semantic-release (#32)

Replace release-please with semantic-release for automated versioning
and changelog generation. Semantic-release uses conventional commits
to determine version bumps and generates changelogs automatically.

Author: jeffh

.github/workflows/prerelease.yml

@@ -1,22 +1,40 @@
-name: Create Release
+name: Release
 
 on:
-  workflow_dispatch:
+  push:
+    branches:
+      - main
 
 permissions:
   contents: write
+  issues: write
   pull-requests: write
 
 jobs:
   release:
-    name: Create Release PR
+    name: Release
     runs-on: ubuntu-latest
 
     steps:
-      - name: Run release-please
-        uses: googleapis/release-please-action@v4
+      - name: Checkout
+        uses: actions/checkout@v4
         with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          config-file: release-please-config.json
-          manifest-file: .release-please-manifest.json
-          prerelease: false
+          fetch-depth: 0
+          persist-credentials: false
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 'lts/*'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run tests
+        run: npm test
+
+      - name: Release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: npm run semantic-release

.github/workflows/release.yml

@@ -0,0 +1,27 @@
+{
+  "branches": ["main"],
+  "plugins": [
+    "@semantic-release/commit-analyzer",
+    "@semantic-release/release-notes-generator",
+    [
+      "@semantic-release/changelog",
+      {
+        "changelogFile": "CHANGELOG.md"
+      }
+    ],
+    [
+      "@semantic-release/npm",
+      {
+        "npmPublish": false
+      }
+    ],
+    [
+      "@semantic-release/git",
+      {
+        "assets": ["CHANGELOG.md", "package.json", "package-lock.json"],
+        "message": "chore(release): ${nextRelease.version} [skip ci]\n\n${nextRelease.notes}"
+      }
+    ],
+    "@semantic-release/github"
+  ]
+}