feat(rpm): add packit configuration and RPM spec file

[maxamillion]

Summary

Add RPM packaging with Packit-as-a-Service integration for automated COPR builds.

• openshell.spec: RPM spec producing two packages:
  • openshell -- the CLI binary
  • python3-openshell -- the Python SDK subpackage
  • Uses vendored Cargo dependencies (Source1) for hermetic offline builds
• .packit.yaml: Packit configuration with two build jobs:
  • PR builds (fedora-all + epel-10) -- triggered on every pull request for CI validation
  • Release builds to maxamillion/openshell COPR -- triggered on GitHub releases

Versioning Strategy

The get-current-version action derives the RPM Version from the upstream
NVIDIA/OpenShell release tag at the midstream/main merge-base:

MERGE_BASE=$(git merge-base origin/midstream origin/main)
git describe --tags --match 'v*' --abbrev=0 "$MERGE_BASE"

This means:

• Version always tracks the upstream release the midstream is based on (currently 0.0.21)
• PR/dev builds get a Packit-generated Release starting with 0. (e.g., 0.1.20260403gitd92caee2.pr9) clearly marking them as dev cuts
• Release builds get Release 1%{?dist}
• When main is synced to a new upstream tag, the Version bumps automatically

Prerequisites

• Upstream v* tags must be synced to this repo (git push origin --tags after fetching from upstream)
• Packit GitHub App must be installed on this repo (done)
• COPR project maxamillion/openshell must list github.com/LobsterTrap/OpenShell in allowed forge projects (done)

Testing

• packit srpm succeeds locally and produces a valid SRPM
• Packit-as-a-Service will validate this PR by submitting COPR builds automatically

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