Merge pull request #2312 from polarathene/chore/dockerfile-simplify-user

chore(Dockerfile): Simplify `testssl` user creation

Author: drwetter

Dockerfile

@@ -4,9 +4,9 @@ RUN apk update && \
     apk upgrade && \
     apk add bash procps drill git coreutils libidn curl socat openssl xxd && \
     rm -rf /var/cache/apk/* && \
-    addgroup testssl && \
-    adduser -G testssl -g "testssl user" -s /bin/bash -D testssl && \
-    ln -s /home/testssl/testssl.sh /usr/local/bin/
+    adduser -D -s /bin/bash testssl && \
+    ln -s /home/testssl/testssl.sh /usr/local/bin/ && \
+    mkdir -m 755 -p /home/testssl/etc /home/testssl/bin
 
 USER testssl
 WORKDIR /home/testssl/