ARG and ENV instructions do not ignore comments correctly

[rcjsuen]

ARG \
# comment
var=value

ENV \
# comment
var=value

import { DockerfileParser, PropertyInstruction } from 'dockerfile-ast';

let dockerfile = DockerfileParser.parse("ENV \\\n# comment");
let instruction = dockerfile.getInstructions()[0];
let properties = (instruction as PropertyInstruction).getProperties();
console.log(properties.length);

dockerfile = DockerfileParser.parse("ENV \\\n# comment\nvar=value");
instruction = dockerfile.getInstructions()[0];
properties = (instruction as PropertyInstruction).getProperties();
console.log(properties.length);
console.log(properties[0].getName());

dockerfile = DockerfileParser.parse("ARG \\\n# comment");
instruction = dockerfile.getInstructions()[0];
properties = (instruction as PropertyInstruction).getProperties();
console.log(properties.length);

dockerfile = DockerfileParser.parse("ARG \\\n# comment\nvar=value");
instruction = dockerfile.getInstructions()[0];
properties = (instruction as PropertyInstruction).getProperties();
console.log(properties.length);
console.log(properties[0].getName());

We should expect the first scenario to not have any properties and the second to have a property with a name of var. This is not the case though.

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