Ability to add keys to dict variable

[sbezverk]

Currently there is no way to add any key to already instantiated variable. It makes building large dictionaries difficult, as all key needs to be specified within a single {{ with }} command.
It would be great to be able to build dict variable by adding 1 key at the time.

example:
{{ $env := dict "blah-1" $blah-1 }}
{{ $env := dict "blah-2" $blah-2 }}
resulting $env having two pairs of keys.

[kfox1111]

+1.

maybe something like
{{ $env := dict "blah-1" $blah-1 }}
{{ $env := dict-update $env "blah-2" $blah-2 }}

[technosophos]

Oops... forgot to close this back when we added set