Allow multiple independent conclusions for checks.

[lhunath]

Currently, we can conclude multiple checks at once using:

      - uses: dflydev/check-runs-action@v1
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          conclusion: success

And we can even specify the checks that this should apply to, using JSON:

      - uses: dflydev/check-runs-action@v1
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          checks: [ { "id": "check-1", name: "Check 1" }, { "id": "check-2", name: "Check 2" } ]
          conclusion: success

But it is impossible to set individual conclusions for the different checks. It seems it would be simple enough:

      - uses: dflydev/check-runs-action@v1
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          checks: [ { "id": "check-1", name: "Check 1", conclusion: "success" }, { "id": "check-2", name: "Check 2", conclusion: "failure", output: { summary: "Meep" } } ]

But this is not currently permitted; and we get the odd message:

Error: invalid format for 'checks: SyntaxError: Unexpected token c in JSON at position 46

This forces us to duplicate the job countless times for each individual check, which is sloppy and a maintenance pain.

Ideally, the checks input would accept the full scope of a check's definition, as specified in https://github.com/dflydev/check-runs-action/blob/master/src/namespaces/Inputs.ts#L28-L42

[lhunath]

My bad, I did not include " around conclusion (ie "conclusion"). I do not understand why it's necessary, but it apparently is; a bit confusing.