chore: release workflow for codegen 3.0

[ewaostrowska]

Summary

Implements the Codegen 3.0 release workflow for branch 3.0.0 as the second part of the release automation split (prepare-release was done earlier). Supports:

• optional generators release,
• dry-run mode with no irreversible operations,
• post-release snapshot PR automation.

What Changed

Workflows

• Added .github/workflows/release-codegen-3.yml
• Removed legacy .github/workflows/release-full-3.yml

Release scripts

• Added CI/release/resolve-release-versions.sh
• Added CI/release/build-codegen-with-generators.sh
• Added CI/release/post-codegen-snapshot.sh
• Updated CI/release/common.sh with shared resolution/validation helpers
• Updated CI/release/update-codegen-release-files.py to support post-release snapshot updates

Flow

1. validate

• resolves versions and release mode,
• verifies release/snapshot prerequisites in Maven metadata,
• protects against accidental redeploys.

2. bootstrap_codegen (only if generators must be released)

• breaks circular dependency by building codegen with bootstrap generators version.

3. generators (optional)

• builds/deploys generators when required.

4. codegen

• builds codegen with resolved generators version,
• deploys codegen (unless skipped/dry-run),
• publishes prepared draft release notes when not dry-run.

5. optional docker and online_deploy

• gated via inputs.

6. post_release_pr

• prepares next snapshot and opens PR to 3.0.0.

Dry-Run Safety

With dry_run=true (default):

• no Maven deploy
• no Docker push
• no Rancher deploy
• no release publication
• post-release PR creation remains allowed (reversible action)

Inputs Added

• release_generators
• skip_maven_deploy
• skip_docker_push
• skip_rancher_deploy
• previous_generators_version
• codegen_generators_bootstrap_version
• dry_run (default: true)

Why

• Completes release automation part 2 for 3.0.0.
• Improves safety, observability, and recovery handling over the old single-job release flow.
• Keeps prepare and release concerns separated while preserving expected release outcomes.

[Copilot]

Pull request overview

Implements a new GitHub Actions release workflow for the 3.0.0 branch (“Codegen 3.0”) by replacing the legacy monolithic release workflow with a staged pipeline and a set of shared release helper scripts. The workflow supports optional generators release, dry-run mode, and post-release automation to open a “next snapshot” PR.

Changes:

• Added a new staged workflow (release-codegen-3.yml) and removed the legacy full release workflow.
• Introduced version-resolution and build helper scripts to validate preconditions, handle the codegen↔generators bootstrap cycle, and gate deploy/publish steps.
• Extended release file update tooling to support a post-release “move back to snapshot” mode and automated snapshot PR preparation.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
CI/release/update-codegen-release-files.py	Adds post mode and snapshot doc update helpers for post-release snapshot automation.
CI/release/resolve-release-versions.sh	New resolver to compute canonical versions/flags and enforce safe release preconditions.
CI/release/post-codegen-snapshot.sh	New script to bump the repo back to the next -SNAPSHOT and update related files.
CI/release/common.sh	Adds shared helpers (notice/output, maven property reads, resolve checks, artifact constants).
CI/release/build-codegen-with-generators.sh	New standardized build wrapper to build codegen against an explicit generators version.
.github/workflows/release-full-3.yml	Removes legacy single-job release workflow.
.github/workflows/release-codegen-3.yml	Adds the new multi-stage release workflow with dry-run and post-release PR automation.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.