fix casing warnings

Author: keithly

Dockerfile

@@ -1,11 +1,11 @@
 ARG AL_PROVIDED_VERSION=al2023.2026.01.19.11
 ARG ARCH=x86_64
-FROM public.ecr.aws/lambda/provided:${AL_PROVIDED_VERSION}-${ARCH} as base
+FROM public.ecr.aws/lambda/provided:${AL_PROVIDED_VERSION}-${ARCH} AS base
 RUN dnf -y update && \
     dnf -y install shadow-utils && \
     dnf clean all
 
-FROM base as builder
+FROM base AS builder
 RUN dnf -y update && \
     dnf -y install gcc openssl-devel bzip2-devel libffi-devel xz-devel zlib-devel tar xz && \
     dnf clean all

simple-example/Dockerfile

@@ -1,7 +1,7 @@
 # based on this example
 # https://github.com/aws/aws-lambda-python-runtime-interface-client/blob/970e9c1d2613e0ce9c388547c76ac30992ad0e96/README.md
 
-FROM public.ecr.aws/docker/library/python:3.14.2-slim-trixie as build-image
+FROM public.ecr.aws/docker/library/python:3.14.2-slim-trixie AS build-image
 
 # Install aws-lambda-cpp build dependencies (for awslambdaric)
 RUN apt-get update && \