add no-cache flag to docker build and remove download.sh script from docker build

Dockerfile

@@ -10,7 +10,6 @@ RUN pip3 install --user sklearn
 
 WORKDIR /dataset
 COPY ./script.py ./
-COPY ./download.sh ./
 COPY ./imdb_top_1000.csv ./
 
 CMD python3 ./script.py

Jenkinsfile

@@ -5,7 +5,7 @@ pipeline {
 
       stage ("Build Docker image") {
             steps {
-                    sh 'docker build -t ium_docker .'
+                    sh 'docker build --no-cache -t ium_docker .'
                   }
             }
       }