dont use fixed workspace path for building

Jenkinsfile

@@ -29,17 +29,19 @@ pipeline{
   {
     stage('Build') {
       steps {
-        sshCommand remote: remote, command: '''
-        set -e
-        export WORKSPACE=$(realpath "./jenkins/workspace/ci-yocto")
-        cd $WORKSPACE
-        docker buildx build \
+        sh'''
+          export -p | tee build.source
+cat <<"EOF" >>build.source
+          cd $WORKSPACE
+          docker buildx build \
             --platform amd64 \
             --output "type=docker,push=false,name=xsangle/ci-yocto:focal" \
             .
             docker tag xsangle/ci-yocto:focal workstation:5000/xsangle/ci-yocto:focal
             docker push workstation:5000/xsangle/ci-yocto:focal
+EOF
         '''
+        sshScript remote: remote, script: "build.source"
       }
     }
   }