log_data should be a LONGBLOB

[danog]

Component

agent

Describe the bug

logs.log_data should be a LONGBLOB or greater: particularly long log lines (>65kb) causes issues with mysql's default BLOB type used by xorm for byte arrays: manually altering the table fixed the issue for me, but it would be probably better to alter the type for everyone :)
I don't use pipeline artifacts, but I bet the same problem would be present in files bigger than 65kb when using mysql.

System Info

`woodpeckerci/woodpecker-agent:next` on arm64

Additional context

No response

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