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Fetch the complete documentation index at: https://buildcharts.dev/llms.txt

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You can make one BuildCharts stage depend on another, even when the stages are implemented in different chart Dockerfiles. BuildCharts does this through Docker Buildx Bake target contexts. A context maps a name to either:
  • Another Bake target (target:<name>)
  • An image (docker-image://...)
This is separate from chart dependencies in charts/buildcharts/Chart.yaml. For that, see Charts.

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Use the default build stage context

For every generated target except build, BuildCharts wires a context named build to the build target: 
contexts = {
  build = "target:build"
}
This allows chart Dockerfiles to use build as an upstream stage, for example: 
FROM build AS pre-docker
This works because target:build refers to the generated Bake target named build. BuildCharts requires exactly one build target in build.yml, so this build context is stable and unambiguous.

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Depend on other targets

This is currently not configurable in build.yml, but you can still do it with Bake overrides at execution time. 
docker buildx bake --file .buildcharts/docker-bake.hcl docker --set docker.contexts.publish=target:publish
Last modified on April 18, 2026