fix(ci): checkout repository in prepare job to fix priority-gate execution crash

.turbo/7d27d7d8e3c30797-manifest.json

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.turbo/7d27d7d8e3c30797-meta.json

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.turbo/c3b4dbd60e2d475a-manifest.json

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.turbo/c3b4dbd60e2d475a-meta.json

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.turbo/ea9126c55a797120-manifest.json

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.turbo/ea9126c55a797120-meta.json

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