fix: configure legacy release action

(only use "fix" prefix to trigger a dummy release)

.github/workflows/legacy-release.yml

@@ -0,0 +1,27 @@
+name: Legacy Release
+on:
+  push:
+    branches:
+      - 3.x
+jobs:
+  release:
+    name: Release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Setup Node
+        uses: actions/setup-node@v1
+        with:
+          node-version: 16
+      - name: Install & Build
+        run: |
+          npm ci
+          npm run build
+      - name: Release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+        run: npx semantic-release

.releaserc.yml

@@ -1,4 +1,5 @@
 branches:
   - name: master
+  - name: 3.x
   - name: beta
     prerelease: true