Added ability to change the final Docker image for misbehaving-jmx-se…

…rver

tools/misbehaving-jmx-server/Dockerfile

@@ -1,3 +1,6 @@
+# syntax=docker/dockerfile:1
+# Use by default the JDK image used to build the jar
+ARG FINAL_JRE_IMAGE=base
 # Use the official JDK image as the base image
 FROM eclipse-temurin:17 AS base
 
@@ -9,22 +12,29 @@ WORKDIR /app
 # Copy the pom.xml and Maven files and install the dependencies
 COPY .mvn .mvn/
 COPY pom.xml mvnw mvnw.cmd ./
-RUN set -eu &&  \
+RUN --mount=type=cache,target=/root/.m2 \
+    set -eu &&  \
     ./mvnw dependency:resolve;
 
 # Copy the source code and build the JAR file
 COPY src/ src/
-RUN set -eu &&  \
+RUN --mount=type=cache,target=/root/.m2 \
+    set -eu &&  \
     ./mvnw clean package assembly:single;
 
 # Use the base image as the the final image
-FROM base AS final
+FROM ${FINAL_JRE_IMAGE} AS final
+#FROM eclipse-temurin:${JDK_VERSION} AS final
 
 # Set the working directory to /app
 WORKDIR /app
 
+COPY scripts/start.sh /usr/bin/
+
 # Copy the JAR file from the Maven image to the final image
 COPY  --from=build /app/target/misbehavingjmxserver-1.0-SNAPSHOT-jar-with-dependencies.jar .
 
 # Run the supervisor class from the jar
-CMD ["java", "-cp", "misbehavingjmxserver-1.0-SNAPSHOT-jar-with-dependencies.jar", "org.datadog.supervisor.App"]
+ENTRYPOINT [ "/usr/bin/start.sh" ]
+
+CMD [ "org.datadog.supervisor.App" ]

tools/misbehaving-jmx-server/scripts/start.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env sh
+
+set -f
+
+echo "Running $@"
+
+[ -n "$JAVA_OPTS" ] || JAVA_OPTS="-Xmx256M -Xms256M"
+
+# shellcheck disable=SC2086
+java \
+  ${JAVA_OPTS} \
+  -cp misbehavingjmxserver-1.0-SNAPSHOT-jar-with-dependencies.jar \
+  "$@"