feat: initial release of sdFormatLinux-Gui

Dark-themed egui/eframe GUI wrapping sdFormatLinux. Device picker,
label field, streaming log, persistent root shell via pkexec for
single auth per session. CI builds DEB and RPM on GitHub release.

Author: totalretribution

.github/workflows/release.yml

@@ -0,0 +1,66 @@
+name: Release
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  build-packages:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache cargo registry
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: ${{ runner.os }}-cargo-
+
+      - name: Install system build dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y \
+            libgl-dev \
+            libx11-dev \
+            libxcb1-dev \
+            libxcb-render0-dev \
+            libxcb-shape0-dev \
+            libxcb-xfixes0-dev \
+            libxkbcommon-dev \
+            libwayland-dev \
+            pkg-config \
+            rpm
+
+      - name: Install cargo-deb and cargo-generate-rpm
+        run: |
+          cargo install cargo-deb --locked
+          cargo install cargo-generate-rpm --locked
+
+      - name: Set package version from release tag
+        run: |
+          VERSION=${GITHUB_REF_NAME#v}
+          sed -i "s/^version = \".*\"/version = \"$VERSION\"/" Cargo.toml
+
+      - name: Build release binary
+        run: cargo build --release
+
+      - name: Build DEB package
+        run: cargo deb --no-build
+
+      - name: Build RPM package
+        run: cargo generate-rpm
+
+      - name: Upload packages to release
+        uses: softprops/action-gh-release@v2
+        with:
+          files: |
+            target/debian/*.deb
+            target/generate-rpm/*.rpm

.gitignore

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+/target