ci: 새로운 버전이 퍼블리쉬 될때 코코아팟에 배포 되도록 수정

- 버전은 태그에서 가져오도록 수정함

.github/workflows/release.yml

@@ -1,9 +1,7 @@
 name: Release
 on:
-  push:
-    branches:
-      - master
-
+  release:
+    types: [published]
 env:
   GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
@@ -15,14 +13,9 @@ jobs:
     - uses: actions/checkout@v2
 
     - name: extract_version_info
-      run: echo "##[set-output name=version;]$(echo '${{ github.event.head_commit.message }}' | egrep -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}')"
+      run: echo "::set-output name=version::$(git describe --tags $(git rev-list --tags --max-count=1))"
       id: extract_version_name       
 
-    - uses: release-drafter/release-drafter@v5
-      with:
-          publish: true
-          tag: ${{ steps.extract_version_name.outputs.version }}
-
     - name: Install Cocoapods
       run: gem install cocoapods