fix: split Dockerfile for GoReleaser and local builds

[pavelanni]

Summary

• Restore Dockerfile to expect a pre-built binary (GoReleaser passes only Dockerfile + binary into the Docker context)
• Move full build-from-source Dockerfile to Dockerfile.local for local dev
• Add make image target that builds via podman -c rhel using Dockerfile.local

Fixes the v0.2.0 release build failure where GoReleaser could not find go.mod in the Docker context.

Test plan

• make image builds successfully via podman
• GoReleaser release build passes (retag after merge)

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 6951771a-afd1-49e3-8b35-bec3f4cb1f0d

📥 Commits

Reviewing files that changed from the base of the PR and between 07d6af3 and 2b45d40.

📒 Files selected for processing (3)

• Dockerfile
• Dockerfile.local
• Makefile

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/goreleaser-dockerfile

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