Add dotnet inner sandbox image recipe (.sandcastle/Dockerfile.dotnet)#106
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First concrete per-language Dockerfile variant, per ADR-0002's addendum and ADR-0024: mcr.microsoft.com/dotnet/sdk:8.0 base (lean official upstream SDK image, not a sibling devcontainer-dotnet8 image), mirroring the existing Dockerfile/Dockerfile.opencode pattern (git+curl, non-root user rename, Claude Code CLI via the native installer). Claude tier only. mcr.microsoft.com/dotnet/sdk:8.0 ships its own pre-existing non-root user `app` at uid=1654/gid=1654 (not 1000 like the Node image's `node` user) -- renamed to `agent` per the existing "rename if present" policy, with AGENT_UID/AGENT_GID defaults set to 1654 to match. Verified: docker build succeeds; smoke-tested git/curl/dotnet/claude CLI all work as the non-root `agent` user. Implements issue #1 of .scratch/dotnet-afk-support/PRD.md (this workspace's local tracker, not this repo's own issue tracker). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Copy-pasteable recipe for running /afk & /hitl against a non-TypeScript (dotnet) target project: README + orchestrator.env template pointing SANDCASTLE_IMAGE at the dotnet inner image (sandcastle-dotnet:local, #106) and AGENTIC_REPO at the validation fixture repo (lsfera/dotnet-afk-proof). Structural first for examples/ — every prior example is a pure tier/model config recipe; this one also points at a non-default inner image and an external repo, so it's the first to actually set AGENTIC_REPO. One new row added to examples/README.md's table; no other entries touched. Implements issue #3 of .scratch/dotnet-afk-support/PRD.md (this workspace's local tracker). Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>
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Summary
mcr.microsoft.com/dotnet/sdk:8.0base, mirroring the existingDockerfile/Dockerfile.opencodepattern (git+curl, non-root user rename, Claude Code CLI via the native installer). Claude tier only.mcr.microsoft.com/dotnet/sdk:8.0ships its own pre-existing non-root userappat uid=1654/gid=1654 (not 1000 like the Node image'snodeuser) — renamed toagentper the existing "rename if present" policy, withAGENT_UID/AGENT_GIDdefaults set to 1654 to match.Verification
docker build -f .sandcastle/Dockerfile.dotnet .sandcastlesucceeds.docker run --entrypoint sh):git --version,curl --version,dotnet --version(8.0.422),claude --version(2.1.201) all work as the non-rootagentuser (uid=1654) in/home/agent..sandcastle/*.tsorchestrator code touched — Dockerfile-only change.Implements issue
01of.scratch/dotnet-afk-support/PRD.md(this workspace's local issue tracker).🤖 Generated with Claude Code