Build ARM64 Docker images

[SwarnimWalavalkar]

Summary

• Build the Docker release image as a multi-arch manifest for linux/amd64 and linux/arm64.
• Add QEMU setup where the workflow now builds multi-platform images on ubuntu-latest.
• Remove known amd64-only base-image blockers where present: replace the docker-jq helper base with Alpine + jq, and move Statuspage to the checked multi-arch Vigil v1.28.6 tag.

Supports devfolioco/infra#4050.

Verification

• Parsed the touched workflow YAML files with Ruby YAML.
• Ran git diff --check across the touched repos.
• Inspected non-standard base image manifests; endeveit/docker-jq:latest and valeriansaliou/vigil:v1.27.0 were amd64-only, while valeriansaliou/vigil:v1.28.6, clux/muslrust:stable, and ghcr.io/devfolioco/devfolio-frontend-base:latest include arm64.
• Did not run Docker image builds locally.