feat: auto-tag on push to main

Use mathieudutour/github-tag-action to automatically bump version
and create tags when pushing to main. Version bump is determined
by conventional commit prefixes (fix: patch, feat: minor).

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: brtkwr

.github/workflows/ci.yaml

@@ -0,0 +1,25 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+
+jobs:
+  test:
+    uses: ./.github/workflows/test.yaml
+
+  tag:
+    needs: test
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Bump version and push tag
+        uses: mathieudutour/github-tag-action@v6.2
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          default_bump: patch

.github/workflows/test.yaml

@@ -1,8 +1,6 @@
 name: Test
 
 on:
-  push:
-    branches: [main]
   pull_request:
     branches: [main]
   workflow_call: