Raplce implicit docker calls with shared library steps

Jenkinsfile

@@ -1,3 +1,5 @@
+@Library('example-shared-lib@main') _
+
 pipeline {
     agent {
         label "docker-agent-dsrv02"
@@ -54,23 +56,21 @@ pipeline {
 
         stage('Build Docker Image') {
             steps {
-                echo "Building Docker image..."
-                sh "docker build -t ${DOCKER_REGISTRY}/${IMAGE_NAME}:${BUILD_ID} -f deployments/docker/Dockerfile deployments/docker/"
+                dockerBuild(
+                    imageName: "${IMAGE_TAG}",
+                    dockerfile: "deployments/docker/Dockerfile",
+                    context: "deployments/docker"
+                )
             }
         }
 
         stage('Push Docker Image') {
             steps {
-                withCredentials([usernamePassword(
-                    credentialsId: 'postio-bot-gitea', // <-- Update to your Jenkins credentials ID
-                    usernameVariable: 'DOCKER_USER',
-                    passwordVariable: 'DOCKER_PASS'
-                )]) {
-                    echo "Logging into Docker registry..."
-                    sh "echo $DOCKER_PASS | docker login ${DOCKER_REGISTRY} -u $DOCKER_USER --password-stdin"
-                    echo "Pushing Docker image..."
-                    sh "docker push ${DOCKER_REGISTRY}/${IMAGE_NAME}:${BUILD_ID}"
-                }
+                dockerPush(
+                    imageName: "${IMAGE_TAG}",
+                    registry: "${DOCKER_REGISTRY}",
+                    credentialsId: "postio-bot-gitea"
+                )
             }
         }
     }