github.com/nektos/act@v0.2.63/pkg/runner/testdata/evalmatrix-merge-map/push.yml (about)

     1  on: push
     2  jobs:
     3    a:
     4      strategy:
     5        matrix:
     6          a:
     7          - env:
     8                key1: val1
     9                ${{insert}}:
    10                   key2: val2
    11                ${{ insert }}: ${{fromJSON('{"key3":"val3"}')}}
    12      runs-on: ubuntu-latest
    13      steps:
    14      - run: exit ${{ (matrix.a.env.key2 == 'val2' && matrix.a.env.key1 == 'val1' && matrix.a.env.key3 == 'val3' ) && '0' || '1' }}