Integration test template build

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Description

Create a template dedicated to running integration tests. For now we're interested in having a full-blown nextjs app running in the sandboxes to check their behavior under various conditions.

Test

cd packages/js-sdk/tests/integration/template/
E2B_DOMAIN=e2b-staging.com e2b template build

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E2B-1361 Create integration test template

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Latest commit: 7dc89ac

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