ci: add workflows and dependabot

.github/dependabot.yml

@@ -0,0 +1,12 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "maven"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 20

.github/workflows/project.yml

@@ -0,0 +1,35 @@
+name: Project CI
+
+on:
+  push:
+    branches: ['main']
+  pull_request: 
+    branches: ['main']
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix: 
+        java: ['11']
+
+    name: Java ${{ matrix.java }}
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up JDK ${{ matrix.java }}
+        uses: actions/setup-java@v3
+        with:
+          java-version: '${{ matrix.java }}'
+          distribution: 'temurin'
+          cache: maven
+      - name: Check license hearders
+        run: ./mvnw license:check
+
+      - name: Check NOTICE
+        run: ./mvnw -B notice:check
+
+      - name: Build backend
+        run: ./mvnw -B package --file pom.xml