feat(rulesets): add instance key to ruleset

[wsan3]

Description

• Add instance key to ruleset tag
• Enable steps to match and run on certain instances (e.g. dev vs prod)

Example

version: "1"

steps:
  - name: run step on production instance
    ruleset:
      event: push
      branch: main
      instance: https://octocat.prod.github.com
    image: alpine
    commands:
      - echo "this step ran on a production instance"

Related

go-vela/community#803

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.79%. Comparing base (d83c78e) to head (0af6469).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1157   +/-   ##
=======================================
  Coverage   52.78%   52.79%           
=======================================
  Files         551      551           
  Lines       19220    19221    +1     
=======================================
+ Hits        10146    10147    +1     
  Misses       8510     8510           
  Partials      564      564           

Files with missing lines	Coverage Δ
compiler/native/compile.go	71.73% <100.00%> (+0.10%)	⬆️

[KellyMerrick]

lgtm