chore: add CI check for linuxbrew (#4)

Author: cmoog

.github/workflows/test.yaml

@@ -3,7 +3,10 @@ on: [push]
 
 jobs:
  coder_cli:
- runs-on: macos-latest
+ strategy:
+ matrix:
+ os: [macos-latest, ubuntu-latest]
+ runs-on: ${{ matrix.os }}
  steps:
  - uses: actions/checkout@v1
  - run: brew install --build-from-source ./coder.rb