feat: Add CI workflows

.github/workflows/build.yaml

@@ -0,0 +1,27 @@
+name: Build
+on:
+  pull_request:
+  workflow_call:
+
+jobs:
+  gradle:
+    name: Gradle build
+    strategy:
+      matrix:
+        os: [ ubuntu-latest, macos-latest, windows-latest ]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 21
+      - name: Setup Gradle
+        uses: gradle/gradle-build-action@v2
+        with:
+          gradle-version: 8.5
+      - name: Run build and tests
+        run: ./gradlew buildAll

.github/workflows/docker-image.yaml

@@ -0,0 +1,32 @@
+name: Docker image
+on:
+  push:
+    branches: [ "main" ]
+
+jobs:
+  build:
+    name: Build
+    uses: ./.github/workflows/build.yaml
+  jib:
+    name: Create and publish Docker image
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 21
+      - name: Setup Gradle
+        uses: gradle/gradle-build-action@v2
+        with:
+          gradle-version: 8.5
+          cache-read-only: true
+      - name: Create and publish docker image
+        run: ./gradlew -Prelease.useLastTag=true final jib
+        env:
+          USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
+          PASSWORD: ${{ secrets.DOCKERHUB_PASSWORD }}