[feat] add new action (JoinArena) · planetarium/lib9c@a171e22

The following actions use a deprecated Node.js version and will be forced to run on node20: actions/setup-dotnet@v3. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

build: .Libplanet/src/Libplanet.Store/BlockSet.cs#L160

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build: .Libplanet/src/Libplanet.Action/IPolicyActionsRegistry.cs#L14

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build: .Libplanet/src/Libplanet.Action/IPolicyActionsRegistry.cs#L21

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build: .Libplanet/src/Libplanet.Action/IPolicyActionsRegistry.cs#L28

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build: .Libplanet/src/Libplanet.Action/IPolicyActionsRegistry.cs#L13

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build: .Libplanet/src/Libplanet.Action/IPolicyActionsRegistry.cs#L20

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build: .Libplanet/src/Libplanet.Action/IPolicyActionsRegistry.cs#L27

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build: .Libplanet/src/Libplanet.Action/IPolicyActionsRegistry.cs#L14

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build: .Libplanet/src/Libplanet.Action/IPolicyActionsRegistry.cs#L21

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build: .Libplanet/src/Libplanet.Action/IPolicyActionsRegistry.cs#L28

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