feat(templates): add Cal.diy self-hosted scheduling starter

[dviejokfs]

Summary

• Adds crates/temps-core/templates/starters/cal-diy.yaml, a project-creation starter for Cal.diy (Cal.com's MIT-licensed, self-hosted community edition of Calendly-style scheduling)
• Builds from the upstream repo via the dockerfile preset (it ships a root Dockerfile), requests a linked postgres service, and declares the real required env vars sourced from cal.diy's own .env.example (DATABASE_URL, DATABASE_DIRECT_URL, NEXTAUTH_SECRET, CALENDSO_ENCRYPTION_KEY, etc.), marking credential-shaped values secret: true
• Placed under templates/starters/ (source-build) rather than templates/services/ (the pinned-image catalog): the services/ validator requires an immutable sha256-pinned image, and there's no verifiably published runnable image for cal.diy to pin (its GHCR listing only shows a build-cache package)

Why

Lets operators self-host scheduling/booking infrastructure (e.g. for a "book a setup call" onboarding step) on Temps instead of a SaaS like Calendly, consistent with the no-vendor-lock-in self-hosting story.

Test plan

• cargo test --lib -p temps-core templates:: — 34 passed (bundled catalog parses and validates)
• cargo check --lib -p temps-core — clean
• python3 scripts/source_attribution.py check — passed
• Pre-commit hooks (yaml check, conventional commit, DCO sign-off) passed
• Not yet exercised end-to-end (one-click deploy from the new starter) — reviewer/maintainer call on whether that's required before merge

[greptile-apps]

Greptile Summary

The PR replaces the Cal.diy source-build starter with an immutable service template and adds architecture-specific image selection.

• Adds separately pinned amd64 and arm64 image digests.
• Selects the image variant using the console host architecture when templates are returned or created.
• Extends template validation and API responses with image_arm64.

Confidence Score: 5/5

The PR appears safe to merge because the previously reported mutable-source deployment path has been replaced by immutable image deployment.

No blocking failure remains.

Important Files Changed

Filename	Overview
crates/temps-core/src/templates.rs	Adds the optional architecture-specific image field and enforces immutable digests for service templates.
crates/temps-core/templates/services/cal-diy.yaml	Defines Cal.diy as a service template using immutable amd64 and arm64 image digests.
crates/temps-projects/src/handlers/handlers.rs	Resolves architecture-specific images before serving or creating projects and adds focused selection tests.
crates/temps-projects/src/handlers/templates.rs	Exposes the optional arm64 image variant in template API responses.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
    A[Load service template] --> B{Console host architecture}
    B -->|aarch64| C[Select image_arm64 digest]
    B -->|other| D[Select default image digest]
    C --> E[Return resolved template]
    D --> E
    E --> F[Create DockerImage project]
    F --> G[Persist immutable image runtime]
    G --> H[Deploy pinned image without source build]

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_{Reviews (4): Last reviewed commit: "fix(templates): pin Cal.diy to calcom/ca..." | Re-trigger Greptile}