Add an entry-point script

- [Instructor] At this point we have a dockerfile in place, … but our action won't do much without and entry-point script. … But before I edit the file, … there's one thing that I really need to do. … I need to make the entry point script executable. … This will allow the script to be run … when the container starts. … I'll do that with the "chmod + X" command. … In this output, we can see that the entry-point script … is now executable. We can tell … by the "X" entries in the mode for the file. … Now, let's take a look at the script. … At the top of the file is the shebang line. … This tells the operating system … which interpreter to use to run the script. … In this case, we're using bash. … I've also added the "set-E" directive, … so bash will exit the scrip immediately … if an error is encountered. … After that are some comments and some commands … outlining what our script does. … If we see the keyword; then do something, … and if not; exit gracefully. … The "$*" is a variable that contains the arguments …