ci: Add CI workflow for Rhai tests

- Added a GitHub Actions workflow to automatically run Rhai tests on
  push and pull request events.
- Created documentation for the CI workflow.
- Improved test runner script to log output to a file and check for
  test failures.

.github/workflows/rhai-tests.yml

@@ -0,0 +1,73 @@
+name: Rhai Tests
+
+on:
+  push:
+    branches: [ '*' ]
+    paths:
+      - 'src/rhai_tests/**'
+      - 'src/rhai/**'
+      - 'src/git/**'
+      - 'src/os/**'
+      - 'run_rhai_tests.sh'
+      - '.github/workflows/rhai-tests.yml'
+  pull_request:
+    branches: [ '*' ]
+    paths:
+      - 'src/rhai_tests/**'
+      - 'src/rhai/**'
+      - 'src/git/**'
+      - 'src/os/**'
+      - 'run_rhai_tests.sh'
+      - '.github/workflows/rhai-tests.yml'
+  workflow_dispatch:  # Allow manual triggering
+
+jobs:
+  rhai-tests:
+    name: Run Rhai Tests
+    runs-on: ubuntu-latest
+    
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+      
+      - name: Set up Rust
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+      
+      - name: Cache Rust dependencies
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-
+      
+      - name: Build herodo
+        run: |
+          cargo build --bin herodo
+          echo "${{ github.workspace }}/target/debug" >> $GITHUB_PATH
+      
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y git curl
+      
+      - name: Run Rhai tests
+        run: |
+          chmod +x run_rhai_tests.sh
+          ./run_rhai_tests.sh
+      
+      - name: Check for test failures
+        run: |
+          if grep -q "Some tests failed" run_rhai_tests.log; then
+            echo "::error::Some Rhai tests failed. Check the logs for details."
+            exit 1
+          else
+            echo "All Rhai tests passed!"
+          fi
+        if: always()