dockerfile 에 imagemagick 툴 설치함.

아직 favlink 이미지 생성 부분은 fix 못했음.
저는 빌드하는데 여기서 오류가 나네요.
오늘 약속이 있어서 좀더 봐야겠습니다.

```shell
Step 4 : RUN apt-get -qq -y install libmagickwand-dev imagemagick
 ---> Running in 81d39fbc5082
E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/libx/libxml2/libxml2_2.9.1+dfsg1-3ubuntu4.2_amd64.deb  404  Not Found [IP: 91.189.91.15 80]

E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/libx/libxml2/libxml2-dev_2.9.1+dfsg1-3ubuntu4.2_amd64.deb  404  Not Found [IP: 91.189.91.15 80]

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
```