ci: 新增自动发版 workflow

.github/workflows/release-tag.yml

+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*' # Push events to matching v*, i.e. v1.0.0
+
+jobs:
+  release:
+    if: github.repository == 'Charles7c/continew-admin'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@master
+      - name: Create Release for Tag
+        id: release_tag
+        uses: yyx990803/release-tag@master
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          body: |
+            详情请参阅 [CHANGELOG.md](https://github.com/${{ github.repository }}/blob/dev/CHANGELOG.md)。
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