plt-1858: Add Java 21 support using 3355.v388858a_47b_33-5-jdk21

Author: szhu95

.github/workflows/ci.yml

@@ -14,6 +14,7 @@ jobs:
         remoting_tag:
           - 4.13.2-1-jdk11
           - 4.13.3-1-jdk17
+          - 3355.v388858a_47b_33-5-jdk21
     runs-on: ubuntu-latest
     steps:
       - name: Build and Push Docker Image

Makefile

@@ -2,11 +2,11 @@ JENKINS_REMOTING_TAG := 4.13.2-1-jdk11
 JOB := remoting-${JENKINS_REMOTING_TAG}
 CLEAN_JOB := clean-${CORE_TAG}
 
-# Default target builds Java 11 variant
-all: remoting-4.13.2-1-jdk11 remoting-4.13.3-1-jdk17
+# Default target builds Java 11, 17, and 21 variants
+all: remoting-4.13.2-1-jdk11 remoting-4.13.3-1-jdk17 remoting-3355.v388858a_47b_33-5-jdk21
 
 clean: ${CLEAN_JOB}
-.PHONY: all clean ${JOB} ${CLEAN_JOB} remoting-4.13.2-1-jdk11 remoting-4.13.3-1-jdk17
+.PHONY: all clean ${JOB} ${CLEAN_JOB} remoting-4.13.2-1-jdk11 remoting-4.13.3-1-jdk17 remoting-3355.v388858a_47b_33-5-jdk21
 
 ${JOB}: remoting-%: Dockerfile
 	docker build \
@@ -26,5 +26,11 @@ remoting-4.13.3-1-jdk17: Dockerfile
 	  --tag dwolla/jenkins-agent-core:4.13.3-1-jdk17-SNAPSHOT \
 	  .
 
+remoting-3355.v388858a_47b_33-5-jdk21: Dockerfile
+	docker build \
+	  --build-arg JENKINS_REMOTING_TAG=3355.v388858a_47b_33-5-jdk21 \
+	  --tag dwolla/jenkins-agent-core:3355.v388858a_47b_33-5-jdk21-SNAPSHOT \
+	  .
+
 ${CLEAN_JOB}: clean-%:
 	docker rmi -f dwolla/jenkins-agent-core:$*-SNAPSHOT