[codex] Add Elixir 1.20 RC OTP 29 image

1.20.0-rc.6-otp-29/Dockerfile

@@ -0,0 +1,30 @@
+FROM hexpm/elixir:1.20.0-rc.6-erlang-29.0-debian-bookworm-20260518
+
+ENV NODE_VERSION="20.12.2"
+ENV NODE_DOWNLOAD_URL="https://nodejs.org/dist/v${NODE_VERSION}/node-v${NODE_VERSION}-linux-x64.tar.xz"
+
+RUN <<EOF
+  set -xe
+  apt-get update
+
+  # Needs to run separately to build on M2/M3 Macs with Rosetta for some reason
+  # Ref: https://github.com/docker/for-mac/issues/7255#issuecomment-2540082464
+  apt-get install -y --no-install-recommends ca-certificates
+
+  # Install git + openssh-client so CI can clone over SSH. Without
+  # openssh-client, CircleCI's checkout step detects "ssh missing" and
+  # falls back to its slow native git client (~12 min for a large repo).
+  apt-get install -y --no-install-recommends git openssh-client
+
+  # Install curl and xz-utils to download and unpack the NodeJS binaries
+  apt-get install -y --no-install-recommends curl xz-utils
+
+  # Dependencies for Elixir to compile binaries
+  apt-get install -y --no-install-recommends make cmake g++
+
+  # Install NodeJS binary
+  curl -fSL -o node-dist.tar.xz $NODE_DOWNLOAD_URL
+  tar -xJf node-dist.tar.xz -C /usr/local --strip-components=1
+  rm node-dist.tar.xz
+  ln -sf /usr/local/bin/node /usr/local/bin/nodejs
+EOF