feat(agent): add configurable static helper image for volume ops#769
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Add a purpose-built agent-helper image (Zig, FROM scratch, ~130 KB) as a smaller alternative to busybox for agent volume population/cleanup, plus a publish workflow and Go build tool. Consolidate the helper image reference into a single configurable source: config.HelperImage resolves explicit config/flag, then DEVSY_HELPER_IMAGE, then config.DefaultHelperImage. Default remains busybox until the shell-based call sites are ported to the helper's subcommands.
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Summary
Adds a purpose-built agent-helper container image as a much smaller alternative to
busyboxfor agent volume operations (population/cleanup), and makes the helper image reference easily configurable so users can stay on busybox or point at a custom image.images/agent-helper/— a single static Zig binary in aFROM scratchimage (~130 KB/arch vs ~4.45 MB forbusybox:latest). Implements justpopulate(stdin → file, chmod 0755) andclean(idempotent unlink) via raw Linux syscalls.hack/agent_helper_image/— Go tool that cross-compiles the helper foramd64/arm64(matches the repo'sgo run ./hack/...convention)..github/workflows/publish-agent-helper.yml— builds a multi-arch manifest and publishes toghcr.io/<owner>/agent-helperon release/dispatch; PRs touching the image build-only. Uses the GitHub App token, actions pinned by SHA. Version is auto-resolved (release tag → latest git tag), with an optional dispatch override.busybox:latestliteral intoconfig.DefaultHelperImage+ aconfig.HelperImage()resolver. Precedence: explicit config/flag →DEVSY_HELPER_IMAGEenv → default.Notes
busybox:latest). The custom image can't become the default until the shell-based call sites (sh -c 'cat > …', version detect,rm -f) are ported to the helper'spopulate/cleansubcommands — that cutover is a deliberate follow-up.packages: writeon this repo.Verification
go build ./...,go vet,gofmtclean; affected package tests pass (addedpkg/config/helper_test.gocovering the resolver precedence).FROM scratchimage builds and passes populate/clean smoke tests locally.