Build GitHub Action: NEAR Contract Upgrade
Description
## Overview
Create a GitHub Action for safely upgrading NEAR smart contracts with migration support.
## Why This Matters
Contract upgrades are risky. An action with built-in safety checks prevents mistakes.
## Technical Requirements
### Action Usage
```yaml
- name: Upgrade Contract
uses: near-actions/upgrade-contract@v1
with:
account-id: mycontract.near
new-wasm: ./target/release/contract.wasm
migration-method: migrate
migration-args: '{}'
backup: true
```
## Deliverables
1. **Upgrade action**
2. **Migration support**
3. **Backup/rollback**
4. **Documentation**
## Budget: 8 NEAR
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