fix(ci): simplify CLI workflow to fix fork PR permissions

[DBosley]

Summary

Simplify the CLI workflow to fix fork PR permission errors and improve maintainability.

Before: 5 jobs with complex dependencies, ghcr.io writes required
After: 4 jobs (test-evm + 2 parallel builds + test-solana), no registry writes

Problem

Fork PR #756 failed with:

denied: installation not allowed to Write organization package

This was introduced in PR #773 (Dec 19) which added ghcr.io push to share images between jobs. Fork PRs don't have write access to the org's package registry.

Solution

Remove ghcr.io dependency entirely. Use GHA layer cache for Docker builds and actions/cache for Solana artifacts.

New Architecture

test-evm ──────────────────────────────────────> ✅
build-solana (v1.0.0) ─┬─> test-solana ────────> ✅
build-solana (v2.0.0) ─┘

• test-evm: Builds cli-local-test target with GHA layer cache
• build-solana: Matrix job builds v1.0.0 and v2.0.0 artifacts in parallel
  • Cached by version + build script hash
  • Fork PRs can read cache from main branch
• test-solana: Downloads pre-built artifacts, runs tests (no compilation needed)

Fork PR Support

Component	How it works for forks
Docker layers	GHA cache readable by forks ✅
Solana artifacts	actions/cache readable from main ✅
Registry writes	None required ✅

Cache Key

solana-v${version}-${hashFiles('cli/test/build-solana.sh', 'Dockerfile.cli', 'Dockerfile.anchor-base', 'solana/Anchor.toml')}

Cache invalidates when build infrastructure changes. Since v1.0.0/v2.0.0 are immutable tags, this is sufficient.

Changes

• Simplify cli.yml workflow (removed ghcr.io push complexity)
• Delete unused Dockerfile.cli-test-evm and Dockerfile.cli-test-solana
• Add fork detection to anchor-base.yml with clear error message
• All jobs run on ubuntu-latest (no tilt runner dependency)

Test plan

• Verify test-evm passes
• Verify build-solana matrix jobs complete
• Verify test-solana passes with pre-built artifacts
• Test from a fork PR to confirm no permission errors

[dvgui]

lgtm