List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-board_size&page=5684
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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        {
            "id": 134729,
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                    "group_size": "3",
                    "maximum_players": 100
                },
                "next_run": "2026-08-24T02:00:00Z",
                "base_points": "10.0"
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}