Add GitHub Actions workflow for building and deploying application

Author: SubProblem

.github/workflows/main.yaml

@@ -0,0 +1,44 @@
+name: Build and Deploy
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v4
+
+      - name: Setup Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'corretto'
+          java-version: '17'
+
+      - name: Build
+        run: mvn clean install -DskipTests
+
+      - name: Login to Docker Hub
+        run: docker login -u ${{ secrets.DOCKER_USERNAME }} -p ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Build Docker Image
+        run: docker build -t subproblem/fitness-tracking-app .
+
+      - name: Publish Image to Docker Hub
+        run: docker push subproblem/fitness-tracking-app:latest
+
+  deploy:
+    needs: build
+    runs-on: aws-ec2-fitness-tracking-app
+    steps:
+      - name: Pull Image from Docker Hub
+        run: docker pull subproblem/fitness-tracking-app:latest
+
+      - name: Delete Old Container
+        run: docker rm -f springboot-fitness-tracking-app-container
+
+      - name: Run Docker Container
+        run: docker run -d -p 8080:8080 --restart always --name springboot-fitness-tracking-app-container subproblem/simple-api:latest