Add support for additional sidecar volumes.

[vorporeal]

Description

Adds a generic mechanism for the server to specify additional sidecar images to mount into task containers. The server sends a list of AdditionalSidecars (image + mount path pairs) in the task assignment, and the worker pulls each image, extracts its filesystem into a digest-keyed Docker volume (with caching), and mounts it into the container.

The first use case is mounting an Xvfb sidecar at /mnt/xvfb-sidecar for computer use support, but the mechanism is intentionally generic so future sidecars can be added without worker-side changes.

The server-side changes that populate AdditionalSidecars are in warpdotdev/warp-server (branch david/support-for-xvfb-in-self-hosted-workers).

Testing

• Tested locally with a self-hosted worker and verified the xvfb sidecar volume is created, cached, and mounted correctly.

Co-Authored-By: Warp agent@warp.dev

[vorporeal]

• Add support for additional sidecar volumes. #18 👈 (View in Graphite)
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