Move GitHub Actions workflow to root directory

GitHub Actions only detects workflows in .github/workflows/ at the repository root.
Moved from nexadb-cli-rust/.github/workflows/ to enable automated builds for nexa CLI.

Author: krishcdbry

.github/workflows/release.yml

@@ -0,0 +1,81 @@
+name: Release Rust CLI
+
+on:
+  push:
+    tags:
+      - 'cli-v*'
+  workflow_dispatch:
+
+jobs:
+  build:
+    name: Build ${{ matrix.target }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        include:
+          # macOS
+          - os: macos-latest
+            target: x86_64-apple-darwin
+            artifact_name: nexa
+            asset_name: nexa-x86_64-apple-darwin
+          - os: macos-latest
+            target: aarch64-apple-darwin
+            artifact_name: nexa
+            asset_name: nexa-aarch64-apple-darwin
+
+          # Linux
+          - os: ubuntu-latest
+            target: x86_64-unknown-linux-gnu
+            artifact_name: nexa
+            asset_name: nexa-x86_64-unknown-linux-gnu
+          - os: ubuntu-latest
+            target: aarch64-unknown-linux-gnu
+            artifact_name: nexa
+            asset_name: nexa-aarch64-unknown-linux-gnu
+
+          # Windows
+          - os: windows-latest
+            target: x86_64-pc-windows-msvc
+            artifact_name: nexa.exe
+            asset_name: nexa-x86_64-pc-windows-msvc.exe
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: ${{ matrix.target }}
+
+      - name: Install cross (Linux ARM only)
+        if: matrix.target == 'aarch64-unknown-linux-gnu'
+        run: cargo install cross
+
+      - name: Build
+        run: |
+          if [ "${{ matrix.target }}" = "aarch64-unknown-linux-gnu" ]; then
+            cross build --release --target ${{ matrix.target }}
+          else
+            cargo build --release --target ${{ matrix.target }}
+          fi
+        shell: bash
+        working-directory: nexadb-cli-rust
+
+      - name: Strip binary (Unix)
+        if: matrix.os != 'windows-latest'
+        run: strip target/${{ matrix.target }}/release/${{ matrix.artifact_name }}
+        working-directory: nexadb-cli-rust
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ matrix.asset_name }}
+          path: nexadb-cli-rust/target/${{ matrix.target }}/release/${{ matrix.artifact_name }}
+
+      - name: Release
+        uses: softprops/action-gh-release@v1
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          files: nexadb-cli-rust/target/${{ matrix.target }}/release/${{ matrix.artifact_name }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}