Update docker alpine:3.19 to use ruby 3.0

Author: williambohrmann3

tools/CI/README_Metadata_StyleCheck/Dockerfile.dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.12
+FROM alpine:3.19
 LABEL author="Hamish Duff <[email protected]>"
 ENV PYTHONUNBUFFERED=1
 # Add scripts for the check.
@@ -13,4 +13,4 @@ RUN echo "**** Install Ruby and mdl ****" && \
     echo "**** Install Python ****" && \
     apk add --no-cache python3 && \
     if [ ! -e /usr/bin/python ]; then ln -sf python3 /usr/bin/python ; fi
-ENTRYPOINT ["python3", "/entry.py"]
+ENTRYPOINT ["python3", "/entry.py"]