build old school with docker because kaniko just explodes in memory usage

Jenkinsfile

@@ -1,21 +1,24 @@
+CONTAINER="docker.qualityminds.de/rd/ai-christmas:latest"
+
 podTemplate(containers: [
-    containerTemplate(name: 'kaniko', image: 'gcr.io/kaniko-project/executor:v1.16.0', command: 'cat', ttyEnabled: true,
-                      resourceRequestCpu: '500m', resourceRequestMemory: '56Gi', resourceLimitMemory: '56Gi')
+    containerTemplate(name: 'docker', image: 'docker:24.0.6-dind', args: '--mtu 1400', privileged: true, ttyEnabled: true,
+                      resourceRequestCpu: '100m', resourceRequestMemory: '8Gi', resourceLimitMemory: '8Gi')
 ]) {
     node(POD_LABEL) {
         stage('checkout') {
             checkout scm
         }
 
-        stage('kaniko build+publish') {
-            container('kaniko'){
-                withCredentials([file(credentialsId: 'docker_auth', variable: 'dockerauth')]) {
-                    sh "ln -s \$dockerauth /kaniko/.docker/config.json"
-                    sh """/kaniko/executor --dockerfile `pwd`/Dockerfile \
-                                           --context `pwd` \
-                                           --destination docker.qualityminds.de/rd/ai-christmas:latest
-                       """
+        container('docker') {
+            stage('docker build') {
+                    sh "docker build --tag $CONTAINER ."
+            }
+
+            stage('docker push') {
+                withCredentials([usernamePassword(credentialsId: 'nexus_jenkins_user', passwordVariable: 'password', usernameVariable: 'user')]) {
+                    sh "docker login $QM_DOCKER_REGISTRY -p \$password -u \$user"
                 }
+                sh "docker push $CONTAINER"
             }
         }
     }