feat: diet image size into 109M (#113)

Author: inureyes

filebrowser/Dockerfile.21.01-ubuntu20.04

@@ -1,20 +1,11 @@
-FROM ubuntu:18.04
+FROM ubuntu:20.04
 
 RUN apt-get update && \
     apt-get install -y \
-        ca-certificates \
-        wget curl git-core \
-        vim-tiny zip unzip \
-        python3 python3-pip \
-        libssl-dev \
-        libmpdec2 \
-        proj-bin libproj-dev \
-        libgeos-dev libgeos++-dev \
-        mime-support \
-        gcc g++ && \
+        ncurses-term && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/
-
+RUN ln -sf /usr/share/terminfo/x/xterm-color /usr/share/terminfo/x/xterm-256color
 ENV PYTHONUNBUFFERED=1 \
     PATH=/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin \
     LANG=C.UTF-8
@@ -29,9 +20,9 @@ LABEL ai.backend.kernelspec="1" \
       ai.backend.features="batch query uid-match user-input" \
       ai.backend.resource.min.cpu="1" \
       ai.backend.resource.min.mem="256m" \
-      ai.backend.base-distro="ubuntu18.04" \
-      ai.backend.runtime-type="python" \
-      ai.backend.runtime-path="/usr/bin/python3" \
+      ai.backend.base-distro="ubuntu20.04" \
+      ai.backend.runtime-type="app" \
+      ai.backend.runtime-path="/usr/bin/filebrowser" \
       ai.backend.service-ports="filebrowser:http:8080"
 COPY policy.yml /etc/backend.ai/jail/policy.yml