Update docs for 1.12.4 (#2540)

Author: lucacome

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+### 1.12.4
+
+An automatically generated list of changes can be found on Github at: [1.12.4 Release](https://github.com/nginxinc/kubernetes-ingress/releases/tag/v1.12.4)
+
+A curated list of changes can be found in the [Releases](http://docs.nginx.com/nginx-ingress-controller/releases/) page on NGINX Documentation website.
+
 ### 2.1.1
 
 An automatically generated list of changes can be found on Github at: [2.1.1 Release](https://github.com/nginxinc/kubernetes-ingress/releases/tag/v2.1.1)

docs/content/releases.md

@@ -6,6 +6,29 @@ doctypes: ["concept"]
 toc: true
 ---
 
+## NGINX Ingress Controller 1.12.4
+
+23 March 2022
+
+CHANGES:
+* Update NGINX version to 1.21.6.
+* Update NGINX Plus version to R26.
+* Update Debian to Bullseye.
+* Update Alpine to 3.15.
+* Update UBI to 8.
+* Update Go to 1.17 and Go dependencies.
+
+FIXES:
+* Fix OpenTracing not working with NGINX Plus.
+
+HELM CHART:
+* The version of the Helm chart is now 0.10.4.
+
+UPGRADE:
+* For NGINX, use the 1.12.4 image from our DockerHub: `nginx/nginx-ingress:1.12.4`, `nginx/nginx-ingress:1.12.4-alpine` or `nginx/nginx-ingress:1.12.4-ubi`
+* For NGINX Plus, please build your own image using the 1.12.4 source code.
+* For Helm, use version 0.10.4 of the chart.
+
 ## NGINX Ingress Controller 2.1.1
 
 17 Feb 2022
@@ -661,8 +684,6 @@ UPGRADE:
 
 ## NGINX Ingress Controller 1.8.0
 
-### 1.8.0
-
 22 July 2020
 
 OVERVIEW: