base image docs, remove CI

Author: skudasov

.github/workflows/k8s-publish-test-base-image.yml

@@ -0,0 +1,8 @@
+.PHONY: build-base
+build:
+	docker build --platform linux/amd64 -t test-base-image -f Dockerfile.base .
+
+push:
+	aws ecr get-login-password --region us-west-2 | docker login --username AWS --password-stdin $(registry).dkr.ecr.us-west-2.amazonaws.com
+	docker tag test-base-image:latest $(registry).dkr.ecr.us-west-2.amazonaws.com/test-base-image:latest
+	docker push $(registry).dkr.ecr.us-west-2.amazonaws.com/test-base-image:latest

lib/k8s/Makefile

@@ -1,3 +1,18 @@
 # K8s Deployment (Deprecated)
 
-[![Documentation](https://img.shields.io/badge/Documentation-MDBook-blue?style=for-the-badge)](https://smartcontractkit.github.io/chainlink-testing-framework/lib/k8s/KUBERNETES.html)
+[![Documentation](https://img.shields.io/badge/Documentation-MDBook-blue?style=for-the-badge)](https://smartcontractkit.github.io/chainlink-testing-framework/lib/k8s/KUBERNETES.html)
+
+## K8s Framework Sunsetting
+
+We were using this `K8s` framework specifically in `sdlc` cluster but after migration to `main.stage` we use it only on-demand for some legacy tests.
+
+### Building Base Image for K8s Tests
+Is rarely required but sometimes we need infrequent updates.
+
+Go to SSO [home](https://sso.smartcontract.com/app/UserHome) and find AWS tile, use creds for `secure-sdlc` account in your terminal, then build and push the image.
+
+```bash
+make build
+make push registry=795953128386
+```
+