create release-it action

.github/workflows/release-it.yml

@@ -0,0 +1,23 @@
+name: release-it
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Increment "major", "minor", "patch", or "pre*" version; or specify version'
+        default: patch
+jobs:
+  main:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: "lts/*"
+          registry-url: https://registry.npmjs.org/
+      - name: Release
+        working-directory: release-it
+        run: |
+          npm i
+          git config user.email "${GITHUB_ACTOR}@users.noreply.github.com"
+          git config user.name "${GITHUB_ACTOR}"
+          npx release-it --ci -- "${{ github.event.inputs.version }}"

release-it/CHANGELOG.md

@@ -8,6 +8,7 @@
 ### Added
 
 - addUnreleased, addVersionUrl
+- create release-it action
 
 ### Fixed