Migrate CustomSteamLauncher to SteamFlow and add Ubuntu 24.04 .deb CI

.github/workflows/rust.yaml

@@ -0,0 +1,52 @@
+name: SteamFlow Rust Build
+
+on:
+  push:
+    paths:
+      - "SteamFlow/**"
+      - ".github/workflows/rust.yaml"
+  pull_request:
+
+jobs:
+  steamflow-deb:
+    runs-on: ubuntu-24.04
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install system dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y \
+            build-essential \
+            pkg-config \
+            libssl-dev \
+            libx11-dev \
+            libxi-dev \
+            libxrandr-dev \
+            libxinerama-dev \
+            libxcursor-dev \
+            libxkbcommon-dev \
+            libasound2-dev \
+            libudev-dev \
+            libwayland-dev \
+            libgtk-3-dev
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Build SteamFlow (release)
+        run: cargo build --release --manifest-path SteamFlow/Cargo.toml
+
+      - name: Install cargo-deb
+        run: cargo install cargo-deb --locked
+
+      - name: Build .deb package
+        run: cargo deb --no-build --manifest-path SteamFlow/Cargo.toml
+
+      - name: Upload .deb artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: steamflow-deb
+          path: |
+            target/debian/*.deb