[monitoring-plugins] Adding non-free source list (Closes: #1837)

[waja]

    Module: monitoring-plugins
    Branch: master
    Commit: 843f17918886edd5c8d14e5a9967785c654053c8
    Author: Jan Wagner <waja at cyconet.org>
 Committer: waja <waja at users.noreply.github.com>
      Date: Mon Feb  6 05:45:36 2023 +0000
       URL: https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=843f179

Adding non-free source list (Closes: #1837)

(due https://lists.debian.org/debian-devel-announce/2023/02/msg00000.html)

---

 .github/prepare_debian.sh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.github/prepare_debian.sh b/.github/prepare_debian.sh
index d8a76da..5222659 100755
--- a/.github/prepare_debian.sh
+++ b/.github/prepare_debian.sh
@@ -5,6 +5,7 @@ set -e
 
 export DEBIAN_FRONTEND=noninteractive
 
+sed "s/main/non-free contrib/g" /etc/apt/sources.list.d/debian.sources > /etc/apt/sources.list.d/debian-nonfree.sources
 apt-get update
 apt-get -y install software-properties-common
 if [ $(lsb_release -is) = "Debian" ]; then