Added deploy GH action.

.github/workflows/deploy.yml

@@ -0,0 +1,40 @@
+name: Deploy
+
+on:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          persist-credentials: false
+
+      - name: Set up JDK
+        uses: actions/setup-java@v1
+        with:
+          java-version: '11'
+
+      - name: Cache Gradle packages
+        uses: actions/cache@v2
+        with:
+          path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+
+      - name: Build
+        run: './gradlew :web:browserDistribution'
+
+      - name: Deploy
+        uses: JamesIves/github-pages-deploy-action@3.6.2
+        with:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          BRANCH: gh-pages
+          FOLDER: web/build/distributions
+          CLEAN: true