This works just like the `build` command where if you have `--build-arg FOO`, it will read the variable from env and only set a value if the variable is defined. Signed-off-by: Brian Goff <cpuguy83@gmail.com>
This works just like the `build` command where if you have `--build-arg FOO`, it will read the variable from env and only set a value if the variable is defined. Signed-off-by: Brian Goff <cpuguy83@gmail.com>