fix(base): add libfontconfig1

Author: Greelan

base/debian/Dockerfile

@@ -20,7 +20,7 @@ RUN         set -eux; \
                 ca-certificates curl wget tar unzip xz-utils bzip2 \
                 coreutils procps iproute2 iputils-ping socat jq git git-lfs gnupg tmux dbus \
                 tini tzdata locales \
-                libssl3 libcurl4 libsqlite3-0 libzstd1 libsdl2-2.0-0 libsdl1.2-compat \
+                libssl3 libcurl4 libsqlite3-0 libzstd1 libsdl2-2.0-0 libsdl1.2-compat libfontconfig1 \
                 # Required for Core Keeper
                 xvfb xauth libxi6 \
                 # Required for Valheim crossplay (and variously some others)