changed single quotes to double

vars/addHelmRepo.groovy

@@ -1,6 +1,6 @@
 def call(String repoName, String repoUrl) {
     container('helm') {
-        sh 'helm repo add ${repoName} ${repoUrl}'
+        sh "helm repo add ${repoName} ${repoUrl}"
         sh 'helm repo update'
         echo "Helm repository '${repoName}' added and updated"
     }

vars/buildJar.groovy

@@ -4,7 +4,7 @@ def call(boolean skipTests = true) {
         if (skipTests) {
             mvnCommand += " -DskipTests"
         }
-        sh 'mvnCommand'
+        sh "${mvnCommand}"
         echo "Jar file ready"
     }
 }

vars/deployHelm.groovy

@@ -6,7 +6,7 @@ def call(String releaseName, String chartRepo, String chartName, String version,
             helmCommand += " --set ${key}=${value}"
         }
 
-        sh 'helmCommand'
-        echo "Helm chart ${chartName} deployed -> $kubeApi"
+        sh "${helmCommand}"
+        echo "Helm chart ${chartName} deployed -> ${kubeApi}"
     }
 }

vars/dockerBuildAndPush.groovy

@@ -1,14 +1,14 @@
 def call(String dockerRepo, String imageName, String dockerfilePath, String buildContext, String nexusUser, String nexusPass) {
     container('docker') {
-        sh 'dockerd --insecure-registry http://$NEXUS_DOCKER_URL &'
+        sh "dockerd --insecure-registry http://$NEXUS_DOCKER_URL &"
         echo "Started Docker daemon"
-        sh 'docker build -t ${imageName} -f ${dockerfilePath} ${buildContext}'
+        sh "docker build -t ${imageName} -f ${dockerfilePath} ${buildContext}"
         echo "Docker image ${imageName} built"
-        sh 'docker login http://${dockerRepo} -u ${nexusUser} -p ${nexusPass}'
+        sh "docker login http://${dockerRepo} -u ${nexusUser} -p ${nexusPass}"
         echo "Logging in to ${dockerRepo}"
-        sh 'docker tag ${imageName} ${dockerRepo}/my-docker-repo/${imageName}:latest'
+        sh "docker tag ${imageName} ${dockerRepo}/my-docker-repo/${imageName}:latest"
         echo "Image ${imageName} tagged"
-        sh 'docker push ${dockerRepo}/my-docker-repo/${imageName}:latest'
+        sh "docker push ${dockerRepo}/my-docker-repo/${imageName}:latest"
         echo "Pushed Docker image ${imageName} to ${dockerRepo}"
     }
 }

vars/makeHelmChart.groovy

@@ -1,6 +1,6 @@
 def call(String chartPath) {
     container('helm') {
-        sh 'helm package ${chartPath}'
+        sh "helm package ${chartPath}"
         echo "Helm chart packaged successfully: ${chartPath}"
     }
 }

vars/uploadHelmChart.groovy

@@ -1,6 +1,6 @@
 def call(String chartFile, String nexusUrl, String nexusUser, String nexusPass) {
     container('maven') {
-        sh 'curl -u ${nexusUser}:${nexusPass} --upload-file ${chartFile} ${nexusUrl}'
+        sh "curl -u ${nexusUser}:${nexusPass} --upload-file ${chartFile} ${nexusUrl}"
         echo "Helm chart uploaded: ${chartFile} -> ${nexusUrl}"
     }
 }