create docker for the API

docker/Dockerfile

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+# Stage 1: Cache Gradle dependencies
+FROM gradle:latest AS cache
+RUN mkdir -p /home/gradle/cache_home
+ENV GRADLE_USER_HOME=/home/gradle/cache_home
+COPY build.gradle.* gradle.properties /home/gradle/app/
+COPY .editorconfig /home/gradle/app/
+COPY gradle /home/gradle/app/gradle
+WORKDIR /home/gradle/app
+RUN gradle clean build -i -x test -x ktlintCheck -x ktlintKotlinScriptCheck
+
+# Stage 2: Build Application
+FROM gradle:latest AS build
+COPY --from=cache /home/gradle/cache_home /home/gradle/.gradle
+COPY --chown=gradle:gradle . /home/gradle/src
+WORKDIR /home/gradle/src
+# Build the fat JAR, Gradle also supports shadow
+# and boot JAR by default.
+RUN gradle buildFatJar --no-daemon
+
+# Stage 3: Create the Runtime Image
+FROM amazoncorretto:21 AS runtime
+EXPOSE 8080
+RUN mkdir /app
+COPY --from=build /home/gradle/src/build/libs/*.jar /app/event-demo-all.jar
+ENTRYPOINT ["java","-jar","/app/event-demo-all.jar"]