CI: update CI scripts to Java 21

Author: Dominick Leppich

.github/workflows/develop-build.yml

@@ -14,11 +14,11 @@ jobs:
     steps:
       - name: Check out source code
         uses: actions/checkout@v4
-      - name: Set up JDK 17
+      - name: Set up JDK 21
         uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
-          java-version: 17
+          java-version: 21
       - name: Set up Maven cache
         uses: actions/cache@v4
         with:

.github/workflows/release-build.yml

@@ -14,11 +14,11 @@ jobs:
     steps:
       - name: Check out source code
         uses: actions/checkout@v4
-      - name: Set up JDK 17
+      - name: Set up JDK 21
         uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
-          java-version: 17
+          java-version: 21
       - name: Set up Maven cache
         uses: actions/cache@v4
         with:

Jenkinsfile

@@ -3,10 +3,7 @@ pipeline {
 
   agent {
     docker {
-      /* using a custom build image with a defined home directory for UID 1000 among other things */
-      image 'nexus.intranda.com:4443/maven:3.9.3-eclipse-temurin-17'
-      registryUrl 'https://nexus.intranda.com:4443'
-      registryCredentialsId 'jenkins-docker'
+      image 'maven:3-eclipse-temurin-21'
       args '-v $HOME/.m2:/var/maven/.m2:z -v $HOME/.config:/var/maven/.config -v $HOME/.sonar:/var/maven/.sonar -u 1000 -ti -e _JAVA_OPTIONS=-Duser.home=/var/maven -e MAVEN_CONFIG=/var/maven/.m2'
     }
   }