Updated ci dockerfile. Moved dockerfiles to outer directory. Updated comments for entrypoint.sh

scripts/entrypoint.sh

@@ -1,5 +1,6 @@
 #!/bin/bash
 
+# used with the dockerfile to set up enviroment variables by running env.sh
 # adapted from https://stackoverflow.com/questions/55921914/how-to-source-a-script-with-environment-variables-in-a-docker-build-process
 
 . /home/riscvuser/chipyard/env.sh