README: add notes about APT repo

Signed-off-by: Attila Szakacs <[email protected]>

README.md

@@ -124,6 +124,37 @@ To uninstall the chart:
 Helm charts would use the latest images by default, but you can customize
 that via the values file.
 For details, see [Install AxoSyslog with Helm](https://axoflow.com/docs/axosyslog-core/install/helm/).
+
+## DEB packages
+
+You can install AxoSyslog on your Debian-based system from Axoflow's APT repository.
+AxoSyslog is a drop-in replacement for syslog-ng, all the binaries and configuration files
+are stored at the same place.
+
+The following x86-64 distros are supported:
+
+| Distro          | sources.list component |
+|-----------------|------------------------|
+| Debian 12       | debian-bookworm        |
+| Debian 11       | debian-bullseye        |
+| Debian Unstable | debian-sid             |
+| Debian Testing  | debian-testing         |
+| Ubuntu 24.04    | ubuntu-noble           |
+| Ubuntu 23.10    | ubuntu-mantic          |
+| Ubuntu 23.04    | ubuntu-lunar           |
+| Ubuntu 22.04    | ubuntu-jammy           |
+| Ubuntu 20.04    | ubuntu-focal           |
+
+To add the APT repo (e.g. Ubuntu 24.04):
+
+    wget -qO - https://pkg.axoflow.io/axoflow-code-signing-pub.asc | gpg --dearmor > /usr/share/keyrings/axoflow-code-signing-pub.gpg
+    echo "deb [signed-by=/usr/share/keyrings/axoflow-code-signing-pub.gpg] https://pkg.axoflow.io/apt stable ubuntu-noble | tee --append /etc/apt/sources.list.d/axoflow.list
+    apt update
+
+Nightly builds are also available:
+
+    echo "deb [signed-by=/usr/share/keyrings/axoflow-code-signing-pub.gpg] https://pkg.axoflow.io/apt nightly ubuntu-noble | tee --append /etc/apt/sources.list.d/axoflow.list
+
 ## Documentation
 
 You can find [comprehensive documentation for AxoSyslog](https://axoflow.com/docs/axosyslog-core)