feat: add self-hosted GitHub runners for dialogporten

[arealmaas]

Description

Provisions per-repo ephemeral self-hosted GitHub Actions runners for Altinn/dialogporten, following the existing per-product pattern in infrastructure/gh-runners/.

• New file: infrastructure/gh-runners/dialogporten.tf
• Address space: 172.17.132.0/24 (next free /24 after platform/correspondence/broker/docs)
• Prefix: dialog (≤ 11 lowercase alphanumeric chars)
• 4.0 CPU / 8Gi memory and tags matching the other product runners

Runners register to the repo with the self-hosted label. On merge to main, altinn-org-gh-runners-deploy.yml runs terraform apply and the runner Container App Job is created.

Context

This unblocks an initial experiment in dialogporten to move lightweight, non-Docker, PR-triggered checks onto self-hosted runners (companion PR in Altinn/dialogporten). This PR must merge and deploy first — otherwise the dialogporten jobs that target self-hosted have no runner to pick them up.

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📥 Commits

Reviewing files that changed from the base of the PR and between 33d2a9e and 43ac22c.

📒 Files selected for processing (2)

• infrastructure/gh-runners/dialogporten-frontend.tf
• infrastructure/gh-runners/dialogporten.tf

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch arealmaas/chengdu-v2

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[arealmaas]

Added infrastructure/gh-runners/dialogporten-frontend.tf — a repo-scoped ephemeral runner for Altinn/dialogporten-frontend (CIDR 172.17.133.0/24, prefix dpfrontend), alongside the dialogporten runner in this PR.

Companion PR that flips that repo's lightweight CI jobs to runs-on: self-hosted: Altinn/dialogporten-frontend#4357. This PR must be merged and applied before that one, or those jobs queue with no runner.