Adding github CI action

.github/workflows/ci.yml

@@ -0,0 +1,60 @@
+name: Slogan Generator CI/CD
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        java-version: [17]  # Currently only 17, but easily extendable
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+      - name: Set up JDK ${{ matrix.java-version }}
+        uses: actions/setup-java@v3
+        with:
+          java-version: ${{ matrix.java-version }}
+          distribution: 'temurin'
+      - name: Cache Maven packages
+        uses: actions/cache@v3
+        with:
+          path: ~/.m2/repository
+          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+          restore-keys: |
+            ${{ runner.os }}-maven-
+      - name: Build with Maven
+        run: ./mvnw clean package
+      - name: Run tests
+        run: ./mvnw test
+
+  docker:
+    needs: build
+    runs-on: ubuntu-latest
+    if: github.ref == 'refs/heads/main'
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      - name: Login to DockerHub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          file: ./src/main/docker/Dockerfile.jvm
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: greystone/slogan-generator:latest

README.md

@@ -1,3 +1,4 @@
+[![CI](https://github.com/thegreystone/slogan-generator/actions/workflows/ci.yml/badge.svg)](https://github.com/thegreystone/slogan-generator/actions/workflows/ci.yml)
 # slogan-generator
 
 This is a simple slogan text or image generator. I wanted to replace the one I have on my homepage,