Show beginning of PHPUnit output in debug comment

https://claude.ai/code/session_01F4RsGjVD4jny3Lder5wqbc

Author: claude

.github/workflows/ci.yml

@@ -115,7 +115,7 @@ jobs:
             script: |
               const fs = require('fs');
               const output = fs.readFileSync('/tmp/phpunit-output.txt', 'utf8');
-              const body = `## PHPUnit failure: PHP ${{ matrix.php-version }}, ClickHouse ${{ matrix.clickhouse-version }}\n\`\`\`\n${output.slice(-3000)}\n\`\`\``;
+              const body = `## PHPUnit failure: PHP ${{ matrix.php-version }}, ClickHouse ${{ matrix.clickhouse-version }}\n\`\`\`\n${output.slice(0, 10000)}\n\`\`\``;
               await github.rest.issues.createComment({
                 owner: context.repo.owner,
                 repo: context.repo.repo,