COPY ↔ to copy new files/dir from <src> to Container fs <dest>
COPY [--chown=<user\>:<group\>] [--chmod=<perms\>] <src\>... <dest\>
COPY [--chown=<user\>:<group\>] [--chmod=<perms\>] ["<src\>",... "<dest\>"]
COPY chmod=rw
COPY must escape [ 0] as [[]0]
COPY filena* to match any filename_beginning_with_filena.txt