fix arm64 docker build for pulumi deploy

[andymeierdev]

Summary

• make the app Docker builder stage run on the local build platform
• download the Tailwind binary for the builder architecture instead of assuming x64
• add CODEOWNERS and keep the Pulumi docker config internal

Why

Pulumi deploys were blocked locally on arm64 because the Dockerfile pinned the SDK image to amd64, which forced emulation and caused dotnet tool restore to crash during the image build.

Verification

• cd app && docker build -f Dockerfile .
• cd pulumi && pulumi refresh --yes
• cd pulumi && pulumi up --yes
• cd pulumi && pulumi up --yes (no changes)

[github-actions]

🍹 preview on andymeier/prod

Pulumi report

View in Pulumi Cloud

  Previewing update (prod)

View Live: https://app.pulumi.com/meiermade/andymeier/prod/previews/4703f1e9-5c9a-4d45-b85a-b5c609d3e7f7

pulumi:pulumi:Stack: (same)
  [urn=urn:pulumi:prod::andymeier::pulumi:pulumi:Stack::andymeier-prod]
  ~ docker-build:index:Image: (update)
      [id=sha256:4220b7870863d07b1de96b565c6d5b26306a51590b5d515cb44734e64b92fa6a]
      [urn=urn:pulumi:prod::andymeier::docker-build:index:Image::andymeier]
    ~ context   : {
        ~ location: "/Users/andy/repos/meiermade/andymeier/app" => "/home/runner/work/andymeier/andymeier/app"
      }
    ~ dockerfile: {
        ~ location: "/Users/andy/repos/meiermade/andymeier/app/Dockerfile" => "/home/runner/work/andymeier/andymeier/app/Dockerfile"
      }
  ~ kubernetes:apps/v1:Deployment: (update)
      [id=andymeier/app]
      [urn=urn:pulumi:prod::andymeier::kubernetes:apps/v1:Deployment::app]
    ~ spec: {
        ~ template: {
            ~ spec: {
                ~ containers: [
                    ~ [0]: {
                            ~ image: "us-east1-docker.pkg.dev/meiermade-platform/platform/andymeier:latest@sha256:85a4b592074b22200f1d213c06545f3369e3e1bd79c95ea66fee51e033c5d085" => [unknown]
                          }
                  ]
              }
          }
      }
Resources:
  ~ 2 to update
  14 unchanged