Remove source code after build

Dockerfile

@@ -19,8 +19,8 @@ RUN mkdir -p ${GOPATH}/src/github.com/gogits && \
     go install && \
     mv ${GOPATH}/bin/gogs /home/cloudron/gogs/ && \
     cp -r ${GOPATH}/src/github.com/gogits/gogs/templates/ /home/cloudron/gogs/. && \
-    cp -r ${GOPATH}/src/github.com/gogits/gogs/public/ /home/cloudron/gogs/.
-#    rm -rf ${GOPATH}
+    cp -r ${GOPATH}/src/github.com/gogits/gogs/public/ /home/cloudron/gogs/. && \
+    rm -rf ${GOPATH}
 
 ADD app.ini.template /home/cloudron/app.ini.template
 ADD start.sh /home/cloudron/start.sh