This commit moves the githubContext, jobContext and stepResult structs
from the runner package to the model package in preparation for #908
because the expression.go file lives in the runner package and would
introduce cyclic dependencies with the exprparser package.
Co-authored-by: Markus Wolf <markus.wolf@new-work.se>
Co-authored-by: Markus Wolf <markus.wolf@new-work.se>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
