FROM Definition does not allow '-' in identifiers

[woidda]

It seems as if minus is not allowed in docker image names.

For example FROM anapsix/alpine-java leads to an error indicator "Missing EOF at '-'".
My guess is that the problem lies in your DSL definition of VALID_IMAGE_NAME which uses ID as reference for valid names.

The ID is inherited from the grammar org.eclipse.xtext.common.Terminals with following definition:

terminal ID : 
  ('^')?('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'_'|'0'..'9')*;

Well, there is no minus allowed here. It should be an easy fix...

[col-panic]

Same goes for COPY commands like

COPY ebox-elexis /opt/ebox-elexis/

which says mismatched input '-' expecting RULE_ONE_SPACE_AND_WHATEVER