Added release workflow

.github/workflows/release.yml

@@ -0,0 +1,56 @@
+name: Release Build
+
+on:
+  release:
+    types: [published]
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: "Release tag to upload to (e.g. 0.1.0)"
+        required: false
+        type: string
+
+jobs:
+  build:
+    name: Build (${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [windows-latest, ubuntu-latest, macos-latest]
+
+    permissions:
+      contents: write
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: dtolnay/rust-toolchain@stable
+
+      - name: Build release binary
+        run: cargo build --release
+
+      # --- Get release tag ---
+      - name: Get release tag
+        id: get_tag
+        shell: bash
+        run: |
+          TAG="${{ inputs.tag }}"
+
+          if [ "${{ github.event_name }}" = "release" ]; then
+            TAG="${{ github.event.release.tag_name }}"
+          elif [ -z "$TAG" ]; then
+            TAG=$(git describe --tags $(git rev-list --tags --max-count=1))
+          fi
+
+          echo "tag=$TAG" >> $GITHUB_OUTPUT
+
+      - name: Upload to GitHub Release
+        uses: softprops/action-gh-release@v2
+        with:
+          tag_name: ${{ steps.get_tag.outputs.tag }}
+          files: |
+            target/release/mist*
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

test/src/main.mist

@@ -13,4 +13,5 @@ class MyClass {
 void main() {
     var my_class = new MyClass("World");
     my_class.greet();
+    var x = 1 + 2 + 3;
 }