In lesson 13, only runs-on: ${{ matrix.os }} passes the checks. Either runs-on: ${{matrix.os }} or runs-on: ${{ matrix.os}} fails.
But in lesson 11, there's no such restriction. if: ${{github.ref == 'refs/heads/master'}} passes the checks.
I understand surrounding expression by one space on each side is a good style to follow, but no spaces surrounded is valid expression syntax too (well it's not explicitly documented, but currently things like ${{matrix.os}} works for real workflow runs.
In lesson 13, only
runs-on: ${{ matrix.os }}passes the checks. Eitherruns-on: ${{matrix.os }}orruns-on: ${{ matrix.os}}fails.But in lesson 11, there's no such restriction.
if: ${{github.ref == 'refs/heads/master'}}passes the checks.I understand surrounding expression by one space on each side is a good style to follow, but no spaces surrounded is valid expression syntax too (well it's not explicitly documented, but currently things like
${{matrix.os}}works for real workflow runs.