Installation: docker image inspect fails

[rddefauw]

Component

CDK / infrastructure

Describe the bug

Following the installation guide (https://github.com/aws-samples/sample-autonomous-cloud-coding-agents/blob/main/docs/guides/DEVELOPER_GUIDE.md), I cloned the repository and ran through the steps up through running the initial build:

npx projen install
npx projen build

While running those commands, I got this error:

[security:image] $ docker image inspect bgagent-local:latest >/dev/null 2>&1 || (ARCH="$(uname -m)"; PLATFORM="linux/arm64"; if [ "$ARCH" = "x86_64" ]; then PLATFORM="linux/amd64"; fi; do…
[+] Building 66.0s (5/5) FINISHED                                                                                                                                      docker:desktop-linux
 => [internal] load build definition from Dockerfile                                                                                                                                   0.0s
 => => transferring dockerfile: 2.76kB                                                                                                                                                 0.0s
 => WARN: RedundantTargetPlatform: Setting platform to predefined $TARGETPLATFORM in FROM is redundant as this is the default behavior (line 3)                                        0.0s
 => WARN: RedundantTargetPlatform: Setting platform to predefined $TARGETPLATFORM in FROM is redundant as this is the default behavior (line 5)                                        0.0s
 => ERROR [internal] load metadata for docker.io/jdxcode/mise:latest                                                                                                                  66.0s
 => [internal] load metadata for ghcr.io/astral-sh/uv:latest                                                                                                                          10.3s
 => [internal] load metadata for docker.io/library/python:3.13-slim                                                                                                                    9.9s
 => [auth] library/python:pull token for registry-1.docker.io                                                                                                                          0.0s
------
 > [internal] load metadata for docker.io/jdxcode/mise:latest:
------

 2 warnings found (use docker --debug to expand):
 - RedundantTargetPlatform: Setting platform to predefined $TARGETPLATFORM in FROM is redundant as this is the default behavior (line 3)
 - RedundantTargetPlatform: Setting platform to predefined $TARGETPLATFORM in FROM is redundant as this is the default behavior (line 5)
Dockerfile:3
--------------------
   1 |     ARG TARGETPLATFORM=linux/arm64
   2 |
   3 | >>> FROM --platform=$TARGETPLATFORM jdxcode/mise:latest AS mise
   4 |
   5 |     FROM --platform=$TARGETPLATFORM python:3.13-slim
--------------------
ERROR: failed to build: failed to solve: jdxcode/mise:latest: failed to resolve source metadata for docker.io/jdxcode/mise:latest: failed to do request: Head "https://registry-1.docker.io/v2/jdxcode/mise/manifests/latest": EOF

View build details: docker-desktop://dashboard/build/desktop-linux/desktop-linux/irphjlv40kve8lpngymep5fbo
[security:image] ERROR task failed
👾 Task "build » post-compile » agent:check" failed when executing "mise run security" (cwd: /Users/<uid>/Documents/sample-autonomous-cloud-coding-agents/agent)

I used an AI coding tool to debug, and it suggested I make this change:

diff --git a/agent/Dockerfile b/agent/Dockerfile
index d0d52e8..1ebb9c5 100644
--- a/agent/Dockerfile
+++ b/agent/Dockerfile
@@ -1,12 +1,7 @@
 ARG TARGETPLATFORM=linux/arm64

-FROM --platform=$TARGETPLATFORM jdxcode/mise:latest AS mise
-
 FROM --platform=$TARGETPLATFORM python:3.13-slim

-# Install mise (polyglot dev tool manager)
-COPY --from=mise /usr/local/bin/mise /usr/local/bin/mise
-
 # Install system dependencies in a single layer:
 #   - Node.js 20 (required by Claude Code CLI)
 #   - git (repo operations)
@@ -20,6 +15,8 @@ RUN apt-get update && \
         build-essential \
         ca-certificates \
         gnupg && \
+    # Install mise (polyglot dev tool manager)
+    curl -fsSL https://mise.run | MISE_INSTALL_PATH=/usr/local/bin/mise sh && \
     # Node.js 20
     curl -fsSL https://deb.nodesource.com/setup_20.x | bash - && \
     apt-get install -y --no-install-recommends nodejs && \

That appeared to work for me, but I am not sure if this is the correct approach.

Expected behavior

Initial install and build steps works.

Current behavior

Initial install and build fails.

Reproduction steps

Clone repo and go through installation guide up through initial install and build.

Possible solution

See suggested diff patch in description.

Node version

v24.13.0

Python version

Python 3.13.9

mise version

2026.4.0 macos-arm64 (2026-04-01)

AWS region

us-west-2

Local modifications

No response

Additional context

No response

AWS quotas

• I have reviewed the relevant service quotas (or N/A)