Add auto publish CI config

Author: ra1028

.github/workflows/publish.yml

@@ -0,0 +1,33 @@
+name: Publish
+on:
+  release:
+    types: [published]
+jobs:
+  publish:
+    name: Publish
+    runs-on: macOS-11.0
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          ref: ${{ github.ref }}
+
+      - name: Validation
+        run: true && [ "${GITHUB_REF##*/}" = "$(cat .version)" ]
+
+      - name: Get ruby gem cache
+        id: gem-cache
+        uses: actions/cache@v2
+        with:
+          path: vendor/bundle
+          key: ${{ runner.os }}-1-gem-${{ hashFiles('Gemfile.lock') }}
+          restore-keys: ${{ runner.os }}-1-gem-
+
+      - name: Install ruby gems
+        if: steps.gem-cache.cache.outputs.cache-hit != 'true'
+        run: make gem
+
+      - name: CocoaPods trunk push
+        run: make pod-release
+        env:
+          COCOAPODS_TRUNK_TOKEN: ${{ secrets.COCOAPODS_TRUNK_TOKEN }}