add jmxfetch.jar to the expected location by datadog (#29151)

datadog-jmxfetch.yaml

@@ -0,0 +1,46 @@
+package:
+  name: datadog-jmxfetch
+  version: 0.49.4
+  epoch: 0
+  description: Export JMX metrics
+  copyright:
+    - license: Apache-2.0
+
+environment:
+  contents:
+    packages:
+      - busybox
+      - ca-certificates-bundle
+      - curl
+      - maven
+      - openjdk-17
+      - openjdk-17-default-jvm
+  environment:
+    LANG: en_US.UTF-8
+    JAVA_HOME: /usr/lib/jvm/java-17-openjdk
+
+pipeline:
+  - uses: git-checkout
+    with:
+      repository: https://github.com/DataDog/jmxfetch
+      tag: ${{package.version}}
+      expected-commit: 76f0a049b18f2b9de52d3937a2759444586c40dc
+
+  - runs: |
+      ./mvnw -DskipTests clean package assembly:single;
+      mkdir -p ${{targets.contextdir}}/opt/datadog-agent/bin/agent/dist/jmx
+      mv target/jmxfetch-*-jar-with-dependencies.jar ${{targets.contextdir}}/opt/datadog-agent/bin/agent/dist/jmx/jmxfetch.jar
+
+update:
+  enabled: true
+  github:
+    identifier: https://github.com/DataDog/jmxfetch
+
+test:
+  pipeline:
+    - runs: |
+        # check if there is a file /opt/datadog-agent/bin/agent/dist/jmx
+        if [ ! -f /opt/datadog-agent/bin/agent/dist/jmx/jmxfetch.jar ]; then
+          echo "jmxfetch.jar not found"
+          exit 1
+        fi