Add GitHub Actions workflow for Tornado-SVM testnet transactions with performance reporting

Author: devloai[bot]

.github/workflows/README.md

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+# Tornado-SVM GitHub Actions Workflows
+
+## Testnet Transaction Metrics Workflow
+
+This workflow automates the process of running Tornado-SVM privacy solution transactions on Solana testnet and generating comprehensive metrics reports.
+
+### Workflow: `tornado_testnet_transaction.yml`
+
+**Purpose:** Execute the complete Tornado-SVM transaction flow on Solana testnet and collect detailed performance metrics.
+
+### Trigger Methods:
+
+1. **Manual Trigger:** Run the workflow on-demand via GitHub UI with configurable parameters
+2. **Scheduled Runs:** Automatically runs weekly on Sundays at midnight UTC
+3. **Pull Request Trigger:** Runs on PRs to the master branch that modify core files
+
+### Configurable Parameters:
+
+- **Denomination:** Amount of SOL to use in the transaction (default: 1 SOL)
+- **Merkle Tree Height:** Height of the Merkle tree for the Tornado instance (default: 20)
+- **RPC URL:** Custom Solana RPC URL (defaults to testnet)
+
+### What the Workflow Does:
+
+1. Sets up the Solana toolchain and required dependencies
+2. Creates a new Solana wallet and requests an airdrop
+3. Deploys the Tornado-SVM program to the Solana testnet
+4. Initializes a new Tornado instance
+5. Performs a complete deposit and withdrawal flow with zkSNARK proofs
+6. Captures detailed metrics at each step including:
+   - Execution times for each phase
+   - Transaction signatures
+   - Compute unit consumption
+   - Gas fees
+   - Transaction details
+7. Generates a comprehensive markdown report with visualizations
+8. Creates a GitHub job summary
+9. Uploads all reports and raw metrics as artifacts
+
+### Artifacts Generated:
+
+- **transaction_report.md:** Complete markdown report with all metrics and visualizations
+- **metrics/*.json:** Raw JSON data for transaction details
+- **metrics/execution_times.txt:** Detailed timing measurements for each phase
+
+### Using the Report:
+
+1. Download the artifact from the completed workflow run
+2. Open the markdown report to view all metrics and visualizations
+3. The report includes:
+   - Executive summary
+   - Configuration details
+   - Transaction logs
+   - Detailed metrics for each transaction
+   - Explorer links for all on-chain activity
+   - Visualizations of the transaction flow and zkSNARK process
+   - Solana network stats during the test
+
+### Example Usage
+
+To manually trigger the workflow with custom parameters:
+
+1. Go to the "Actions" tab in the GitHub repository
+2. Select "Tornado SVM Testnet Transaction Test" workflow
+3. Click "Run workflow"
+4. Enter your desired parameters (denomination, Merkle tree height, RPC URL)
+5. Click "Run workflow"
+6. Once completed, download the artifacts from the workflow run