DEV: Add poppler-utils for PDF -> text handling (#812)

image/base/slim.Dockerfile

@@ -51,7 +51,7 @@ RUN DEBIAN_FRONTEND=noninteractive apt-get -y install autoconf build-essential c
     libreadline-dev anacron wget \
     psmisc whois brotli libunwind-dev \
     libtcmalloc-minimal4 cmake \
-    pngcrush pngquant ripgrep
+    pngcrush pngquant ripgrep poppler-utils
 RUN sed -i -e 's/start -q anacron/anacron -s/' /etc/cron.d/anacron
 RUN sed -i.bak 's/$ModLoad imklog/#$ModLoad imklog/' /etc/rsyslog.conf
 RUN sed -i.bak 's/module(load="imklog")/#module(load="imklog")/' /etc/rsyslog.conf