fix(docker): No need for an architecture ARG

Author: gounthar

dockerfiles/cpp/Dockerfile

@@ -1,8 +1,5 @@
 FROM jenkins/ssh-agent:6.9.0
 
-ARG TARGETARCH
-ENV ARCHITECTURE=$TARGETARCH
-
 # Install necessary C++ build tools
 RUN apt-get update && apt-get install -y --no-install-recommends \
     build-essential \