install cpan deps before running the app

Changes to code will not make the cpan deps be reconstructed

Author: pplusdomain@gmail.com

Dockerfile

@@ -5,13 +5,15 @@ RUN cpanm Carton
 
 WORKDIR /opt/project-x
 
-COPY ./ /opt/project-x
+COPY ./cpanfile cpanfile
+
+RUN carton install 
 
 RUN groupadd -r xman -g 1001 \
     && useradd -u 1001 -r -g xman -d /opt/project-x/ -s /sbin/nologin -c "Docker image user" xman \
     && chown -R xman:xman /opt/project-x/
 
-RUN carton install 
+COPY ./ /opt/project-x
 
 USER 1001
 EXPOSE 8080