Updated iowrt example

examples/iowrt/Dockerfile

 # Alpine Base
-FROM alpine:latest AS builder
+FROM alpine:3.22 AS builder
 
 # Staging area
 RUN apk add --no-cache git cmake make clang build-base llvm-static llvm-dev clang-static clang-dev json-c-dev lua5.1-dev
@@ -38,11 +38,11 @@ COPY src src
 RUN make -C /src
 
 # Final image
-FROM alpine:latest
+FROM alpine:3.22
 
-MAINTAINER Vivek Dutta "vivek.dutta@iopsys.eu"
 ENV VERSION=devel
 LABEL vendor=IOPSYS \
+      org.opencontainers.image.author="vivek.dutta@iopsys.eu"\
       org.opencontainers.image.version=$VERSION\
       org.opencontainers.image.vendor="IOPSYS" \
       org.opencontainers.image.description="IOWRT Application container"