Support artifact-only frontend exports - #1
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Summary
export-pathfrontend build argumentWhy
Flightcontrol static builds currently export and load Railpack's complete runtime image only to copy one static artifact directory back out. BuildKit's local exporter cannot help by itself because the Railpack gateway frontend returns the complete deploy filesystem.
This opt-in frontend behavior narrows the returned LLB state to the requested artifact directory, allowing Flightcontrol to use
--output type=localwithout serializing the runtime image and its parent layers.Validation
go test ./buildkitgolangci-lint run(0 issues)go vet ./...go mod verifygo test -short ./...(all packages pass except four pre-existing PHP dynamic-image snapshots whose patch versions moved: 8.2.31→8.2.32 and 8.4.22→8.4.23)Rollout
After merging, publish the frontend as
public.ecr.aws/a8z1i1r2/railpack-frontend:v0.29.0-fc2. The coordinated Flightcontrol PR is flightcontrolhq/flightcontrol#6647 and remains draft until that immutable image exists.