Add sqlite3 and gdb packages.

Dockerfile

@@ -13,9 +13,9 @@ FROM python:3.6-stretch
 RUN apt-get update && apt-get dist-upgrade -y && apt-get install -y \
       build-essential \
       libxml2-dev libxslt-dev zlib1g-dev libssl-dev libsqlite3-dev \
-      libffi-dev git tmux fontconfig-config fonts-dejavu-core curl \
+      libffi-dev git tmux fontconfig-config fonts-dejavu-core curl sqlite3 sqlite sqlite3-pcre \
       libfontconfig1 libjpeg62-turbo-dev libjpeg62-turbo libjpeg-dev libjpeg-turbo-progs lsof ffmpeg \
-      autossh rsync bundler git tmux python3 libtool pkg-config \
+      autossh rsync bundler git tmux python3 libtool pkg-config gdb python3-dbg \
       build-essential autoconf automake libzmq3-dev libmnl0 make \
       && rm -rf /var/lib/apt/lists/*