I have added deb https://packages.openmediavault.org/public arrakis main to /etc/apt/sources.list.d/openmediavault.list and then I try and run apt update but I get the following output:
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Hit:1 http://security.debian.org/debian-security stretch/updates InRelease
Ign:2 https://downloads.plex.tv/repo/deb ./public InRelease
Hit:3 https://downloads.plex.tv/repo/deb ./public Release
Get:5 https://packages.openmediavault.org/public arrakis InRelease [12.8 kB]
Err:5 https://packages.openmediavault.org/public arrakis InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7E7A6C592EF35D13 NO_PUBKEY 24863F0C716B980B
Ign:6 http://mirror.csclub.uwaterloo.ca/debian stretch InRelease
Hit:7 http://mirror.csclub.uwaterloo.ca/debian stretch-updates InRelease
Hit:8 http://mirror.csclub.uwaterloo.ca/debian stretch-backports InRelease
Hit:9 http://mirror.csclub.uwaterloo.ca/debian stretch Release
Reading package lists... Done
W: GPG error: https://packages.openmediavault.org/public arrakis InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7E7A6C592EF35D13 NO_PUBKEY 24863F0C716B980B
E: The repository 'https://packages.openmediavault.org/public arrakis InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
If I run cat /etc/os-release I get the following:
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PRETTY_NAME="Debian GNU/Linux 9 (stretch)"
NAME="Debian GNU/Linux"
VERSION_ID="9"
VERSION="9 (stretch)"
VERSION_CODENAME=stretch
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"