feat: install cloudflared in devcontainer image

[venkatamutyala]

Adds the cloudflared binary to the devcontainer image.

What changed

.devcontainer/Dockerfile:

• New pinned version arg with a Renovate annotation (matches every other tool in this file):

  # renovate: datasource=github-tags depName=cloudflare/cloudflared
  ARG VERSION_CLOUDFLARED=2026.6.1

• Install step to /usr/local/bin/cloudflared:

  RUN curl -Lo /usr/local/bin/cloudflared https://github.com/cloudflare/cloudflared/releases/download/${VERSION_CLOUDFLARED}/cloudflared-linux-$(dpkg --print-architecture) \
      && chmod +x /usr/local/bin/cloudflared

Arch auto-detection (multi-arch ready)

The URL uses $(dpkg --print-architecture) instead of a hardcoded amd64. dpkg --print-architecture returns amd64 / arm64, which matches cloudflared's release asset names (cloudflared-linux-amd64, cloudflared-linux-arm64) exactly — so this keeps working unchanged if the image becomes a multi-arch build. This mirrors the existing dpkg --print-architecture usage already in this Dockerfile (the 1Password install). Both the amd64 and arm64 asset URLs were verified to resolve (HTTP 200).

Note on pinning vs latest

The original request used the releases/latest/download/... URL. I pinned to the current release (2026.6.1) instead so builds are reproducible and Renovate keeps it current — consistent with how every other binary in this Dockerfile is managed. Happy to switch to latest if you'd prefer.

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