Added CI deployment

.github/workflows/deploy.yml

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+name: Fly Deploy
+on: [push]
+env:
+  FLY_API_TOKEN: ${{ secrets.FLY_API_TOKEN }}
+jobs:
+  deploy:
+      name: Deploy app
+      runs-on: ubuntu-latest
+      steps:
+        - uses: actions/checkout@v2
+        - uses: superfly/flyctl-actions/setup-flyctl@master
+        - run: flyctl deploy demo-app

demo-app/Dockerfile

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+# First stage: JDK build
+FROM openjdk:17 AS build
+
+# Update package lists and Install Maven
+RUN microdnf update -y && \
+    microdnf install -y maven && \
+    microdnf clean all
+
+WORKDIR /usr/src/app
+
+# Copy rest of the dependencies.
+COPY pom.xml .
+RUN mvn dependency:go-offline
+
+# Copy the source code
+COPY . .
+
+## Do the build
+RUN mvn clean install -Pproduction
+
+# Second stage: Lightweight jdk-slim image
+FROM openjdk:17-jdk-slim
+RUN useradd -m appuser
+
+RUN mkdir /app && \
+    chown -R appuser /app
+
+USER appuser
+
+WORKDIR /app
+
+# Copy the native binary from the build stage
+COPY --from=build /usr/src/app/target/idle-demo-*.jar /app/app.jar
+
+# Run the application
+EXPOSE 8080
+ENTRYPOINT ["java", "-jar", "/app/app.jar"]

demo-app/fly.toml

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+app = "idle-demo"
+primary_region = "fra"
+
+[env]
+PORT = "8080"
+
+[http_service]
+internal_port = 8080
+force_https = true
+auto_stop_machines = true
+auto_start_machines = true
+min_machines_running = 0