fixed error of copying yarn.lock when it doesn't exist

Dockerfile

@@ -4,7 +4,7 @@ WORKDIR /app/medusa
 
 COPY package.json .
 COPY develop.sh .
-COPY yarn.lock .
+COPY yarn.* .
 
 RUN apt-get update
 
@@ -18,4 +18,4 @@ RUN npm install
 
 COPY . .
 
-ENTRYPOINT ["./develop.sh"]
+ENTRYPOINT ["./develop.sh"]