jobs.<job-id>.if should support matrix context

[jsoref]

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https://docs.github.com/en/actions/learn-github-actions/contexts#context-availability

I have a workflow that will have a matrix, i shouldn't have to write a job that constructs the matrix and filters things out just to only construct jobs. It should be possible for me to use the matrix context in my if to avoid going to the steps stage - after all, the matrix is available for naming my job...

Workflow key	Context	Special functions
jobs.<job_id>.if	github, needs, vars, inputs	always, cancelled, success, failure
jobs.<job_id>.name	github, needs, strategy, matrix, vars, inputs	None
jobs.<job_id>.steps.if	github, needs, strategy, matrix, job, runner, env, vars, steps, inputs	always, cancelled, success, failure, hashFiles

[bxy4543]

I expect to use if to achieve manual triggering to specify the matrix I want , not all matrix.

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