fix(release): keep prereleases off stable channels

[scarmuega]

Summary

• keep Docker prereleases off stable, major, and minor aliases using declarative docker/metadata-action rules
• keep latest on main, publish exact SemVer tags for releases and prereleases, and retain immutable SHA tags
• document the active Docker channels and storage layout without migration history
• point incompatible-storage errors to the current bootstrap guide

Trellis plan: plans/dolos-v2-release-labels.md

Verification

• checked the current docker/metadata-action documentation for SemVer prerelease and enable behavior
• parsed .github/workflows/docker.yml with Ruby YAML
• git diff --check
• cargo fmt --all -- --check
• cargo clippy --workspace --all-targets --all-features
• cargo build --workspace --all-targets --all-features
• cargo test --workspace --all-targets
• cargo test --workspace --all-features --exclude dolos-minibf --exclude dolos-minikupo --exclude dolos-trp

The full test commands ran outside the restricted sandbox because their HTTP fixtures bind loopback addresses. Both suites completed successfully. Clippy exits successfully with seven existing warnings in snapshot/Cardano test or model code; this PR does not touch those locations.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 49fbfe2 and 4f10237.

📒 Files selected for processing (10)

• .github/workflows/docker.yml
• AGENTS.md
• crates/fjall/src/archive/README.md
• crates/fjall/src/state/README.md
• docs/content/architecture/data-layer.mdx
• docs/content/configuration/schema.mdx
• docs/content/installation/binaries.mdx
• docs/content/installation/docker.mdx
• src/adapters/storage.rs
• src/bin/dolos/init.rs

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[scarmuega]

documentation (in docs or in-place) should not track the history of how v1 was and how v2 is now. The docs are not meant to track history, that's what git is for. Docs are meant to describe the current state.