Ability to load output of command into variable

[ssbarnea]

One very common use case with build tools is to use the output of a command as a variable, like detecting the version of the package and use it later.

VERSION=$(cat version.txt)

If I am correct, right now there is no way to do this with task, and I might need to use the VERSION variable in multiple tasks.

[ghostsquad]

VERSION:
  sh: cat version.txt