updated docker for c from ubuntu

clang/Dockerfile

-FROM frolvlad/alpine-glibc
+FROM gcc:latest
 
-LABEL Description="Image used for latest stable C compilation, based on alpine linux" maintainer="orestis.malaspinas@hesge.ch" Version="0.1"
-
-
-RUN apk add curl
-RUN apk add ca-certificates
-RUN apk add gcc
-RUN apk add make
-RUN apk add zlib-dev
-RUN apk add openssl-dev
-RUN apk add clang
-RUN apk add libc-dev
+LABEL Description="Image used for latest stable C compilation, based on ubuntu" maintainer="orestis.malaspinas@hesge.ch" Version="0.1"
 
+RUN apt update
+RUN apt dist-upgrade -y
+RUN apt install -y clang