ci: Fix debian CI

Building dockerfile was failing with

```
Configuration file '/etc/systemd/system.conf'
==> File on system created by you or by a script.
==> File also in package provided by package maintainer.
What would you like to do about it ? Your options are:
[...]
```

Use non-interactive debian frontend and pass options to apt-get to use
default actions whereever needed and keep existing config files
automatically

Signed-off-by: Pragyan Poudyal <pragyanpoudyal41999@gmail.com>

Author: Johan-Liebert1

contrib/packaging/lib.sh

@@ -33,9 +33,13 @@ pkg_install() {
             dnf clean all
             ;;
         debian|ubuntu)
+            export DEBIAN_FRONTEND=noninteractive
             debian_apt_init
             apt-get -o APT::Sandbox::User=root update
-            apt-get -o APT::Sandbox::User=root install -y --no-install-recommends "$@"
+            apt-get -o APT::Sandbox::User=root \
+                    -o Dpkg::Options::="--force-confold" \
+                    -o Dpkg::Options::="--force-confdef" \
+                install -y --no-install-recommends "$@"
             rm -rf /var/lib/apt/lists/*
             ;;
         *)