fix: documentation

README.md

@@ -23,16 +23,21 @@ The Ruby Runtime Interface Client package currently supports ruby 3.0 and above.
 
 If you're upgrading from 2.x, update your Dockerfile to use the `_HANDLER` environment variable instead of relying on `CMD` arguments.
 
+## Supported Base Operating Systems
+
+The Ruby Runtime Interface Client supports the following Linux distributions:
+
+- **Amazon Linux 2023**
+- **Alpine**
+- **Debian**
+- **Ubuntu**
+
+For Alpine, Debian, and Ubuntu, we support the latest LTS release and the previous LTS release for 6 months after a new LTS version has been released.
+
 ## Usage
 
 ### Creating a Docker Image for Lambda with the Runtime Interface Client
-First step is to choose the base image to be used. The supported Linux OS distributions are:
-
- - Amazon Linux 2023
- - Amazon Linux 2
- - Alpine
- - Debian
- - Ubuntu
+First step is to choose the base image to be used.
 
 In order to install the Runtime Interface Client, either add this line to your application's Gemfile:
 
@@ -56,30 +61,13 @@ set the `_HANDLER` environment variable to specify the desired handler.
 
 Example Dockerfile:
 ```dockerfile
-FROM amazonlinux:latest
-
-# Define custom function directory
-ARG FUNCTION_DIR="/function"
-
-# Install ruby
-RUN dnf install -y ruby3.2 make
-
-# Install bundler
-RUN gem install bundler
-
-# Install the Runtime Interface Client
-RUN gem install aws_lambda_ric
-
-# Copy function code
-RUN mkdir -p ${FUNCTION_DIR}
-COPY app.rb ${FUNCTION_DIR}
-
-WORKDIR ${FUNCTION_DIR}
+FROM public.ecr.aws/lambda/ruby:3.4
 
-# Set the handler via environment variable
-ENV _HANDLER="app.App::Handler.process"
+# Add your handler definition
+ADD test/integration/test-handlers/echo/app.rb .
 
-ENTRYPOINT ["/usr/local/bin/aws_lambda_ric"]
+# Specify your handler
+CMD ["app.App::Handler.process"]
 ```
 
 Note that the `ENTRYPOINT` may differ based on the base image used. You can find the correct path by running an