Improve example Dockerfile

Author: EdKingscote

Dockerfile

@@ -1,6 +1,9 @@
-FROM rundeck:latest
+FROM rundeck/rundeck:latest
 USER root
-RUN curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip" && \
-    unzip awscliv2.zip && \
-	./aws/install
+RUN apt-get update \
+    && apt-get -y upgrade \
+    && apt-get -y install unzip curl python3 python-is-python3 groff \
+    && curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip" \ 
+    && unzip awscliv2.zip \ 
+    && ./aws/install
 USER rundeck