Add Elastic Java distribution for Ad and Fraud services

.github/README.md

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 <!-- markdownlint-disable-next-line -->
 # <img src="https://opentelemetry.io/img/logos/opentelemetry-logo-nav.png" alt="OTel logo" width="32"> :heavy_plus_sign: <img src="https://images.contentstack.io/v3/assets/bltefdd0b53724fa2ce/blt601c406b0b5af740/620577381692951393fdf8d6/elastic-logo-cluster.svg" alt="OTel logo" width="32"> OpenTelemetry Demo with Elastic Observability
 
-The following guide describes how to setup the OpenTelemetry demo with Elastic Observability using [Docker compose](#docker-compose) or [Kubernetes](#kubernetes).
+The following guide describes how to setup the OpenTelemetry demo with Elastic Observability using [Docker compose](#docker-compose) or [Kubernetes](#kubernetes). This fork introduces several changes to the agents used in the demo:
+
+- The Java agent within the [Ad](../src/adservice/Dockerfile.elastic) and [Fraud Detection](../src/frauddetectionservice/Dockerfile.elastic) services have been replaced with the Elastic distribution of the OpenTelemetry Java Agent. You can find more information about the Elastic distribution in [this blog post](https://www.elastic.co/observability-labs/blog/elastic-distribution-opentelemetry-java-agent).
 
 ## Docker compose
 

src/adservice/Dockerfile.elastic

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+FROM eclipse-temurin:21-jdk as builder
+
+WORKDIR /usr/src/app/
+
+COPY ./src/adservice/gradlew* ./src/adservice/settings.gradle* ./src/adservice/build.gradle ./
+COPY ./src/adservice/gradle ./gradle
+
+RUN ./gradlew
+RUN ./gradlew downloadRepos
+
+COPY ./src/adservice/ ./
+COPY ./pb/ ./proto
+RUN ./gradlew installDist -PprotoSourceDir=./proto
+
+# -----------------------------------------------------------------------------
+
+FROM eclipse-temurin:21-jre
+
+ARG version=0.3.2
+WORKDIR /usr/src/app/
+
+COPY --from=builder /usr/src/app/ ./
+ADD --chmod=644 https://repo1.maven.org/maven2/co/elastic/otel/elastic-otel-javaagent/$version/elastic-otel-javaagent-$version.jar /usr/src/app/opentelemetry-javaagent.jar
+ENV JAVA_TOOL_OPTIONS=-javaagent:/usr/src/app/opentelemetry-javaagent.jar
+ENV ELASTIC_OTEL_INFERRED_SPANS_ENABLED=true
+
+EXPOSE ${AD_SERVICE_PORT}
+ENTRYPOINT [ "./build/install/opentelemetry-demo-ad-service/bin/AdService" ]

src/frauddetectionservice/Dockerfile.elastic

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+FROM gradle:8-jdk17 AS builder
+
+WORKDIR /usr/src/app/
+
+COPY ./src/frauddetectionservice/ ./
+COPY ./pb/ ./src/main/proto/
+RUN gradle shadowJar
+
+# -----------------------------------------------------------------------------
+
+FROM gcr.io/distroless/java17-debian11
+
+ARG version=0.3.2
+WORKDIR /usr/src/app/
+
+COPY --from=builder /usr/src/app/build/libs/frauddetectionservice-1.0-all.jar ./
+ADD --chmod=644 https://repo1.maven.org/maven2/co/elastic/otel/elastic-otel-javaagent/$version/elastic-otel-javaagent-$version.jar /usr/src/app/opentelemetry-javaagent.jar
+ENV JAVA_TOOL_OPTIONS=-javaagent:/app/opentelemetry-javaagent.jar
+ENV ELASTIC_OTEL_INFERRED_SPANS_ENABLED=true
+
+ENTRYPOINT [ "java", "-jar", "frauddetectionservice-1.0-all.jar" ]