Restructure project layout for better CI/CD integration

- Flattened nested bootupd/bootupd/ structure to root level
- Moved all core project files to root directory
- Added proper Debian packaging structure (debian/ directory)
- Created build scripts and CI configuration
- Improved project organization for CI/CD tools
- All Rust source, tests, and configuration now at root level
- Added GitHub Actions workflow for automated testing
- Maintained all original functionality while improving structure

.github/workflows/rust.yml

@@ -0,0 +1,119 @@
+# Maintained in https://github.com/coreos/repo-templates
+# Do not edit downstream.
+
+name: Rust
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+permissions:
+  contents: read
+
+# don't waste job slots on superseded code
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  CARGO_TERM_COLOR: always
+  # Pinned toolchain for linting
+  ACTIONS_LINTS_TOOLCHAIN: 1.84.1
+
+jobs:
+  tests-stable:
+    name: Tests, stable toolchain
+    runs-on: ubuntu-latest
+    container: quay.io/coreos-assembler/fcos-buildroot:testing-devel
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+      - name: Install toolchain
+        uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: stable
+      - name: Cache build artifacts
+        uses: Swatinem/rust-cache@v2
+      - name: cargo build
+        run: cargo build --all-targets
+      - name: cargo test
+        run: cargo test --all-targets
+  tests-release-stable:
+    name: Tests (release), stable toolchain
+    runs-on: ubuntu-latest
+    container: quay.io/coreos-assembler/fcos-buildroot:testing-devel
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+      - name: Install toolchain
+        uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: stable
+      - name: Cache build artifacts
+        uses: Swatinem/rust-cache@v2
+      - name: cargo build (release)
+        run: cargo build --all-targets --release
+      - name: cargo test (release)
+        run: cargo test --all-targets --release
+  tests-release-msrv:
+    name: Tests (release), minimum supported toolchain
+    runs-on: ubuntu-latest
+    container: quay.io/coreos-assembler/fcos-buildroot:testing-devel
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+      - name: Detect crate MSRV
+        run: |
+          msrv=$(cargo metadata --format-version 1 --no-deps | \
+              jq -r '.packages[0].rust_version')
+          echo "Crate MSRV: $msrv"
+          echo "MSRV=$msrv" >> $GITHUB_ENV
+      - name: Install toolchain
+        uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: ${{ env.MSRV }}
+      - name: Cache build artifacts
+        uses: Swatinem/rust-cache@v2
+      - name: cargo build (release)
+        run: cargo build --all-targets --release
+      - name: cargo test (release)
+        run: cargo test --all-targets --release
+  linting:
+    name: Lints, pinned toolchain
+    runs-on: ubuntu-latest
+    container: quay.io/coreos-assembler/fcos-buildroot:testing-devel
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+      - name: Install toolchain
+        uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: ${{ env.ACTIONS_LINTS_TOOLCHAIN }}
+          components: rustfmt, clippy
+      - name: Cache build artifacts
+        uses: Swatinem/rust-cache@v2
+      - name: cargo fmt (check)
+        run: cargo fmt -- --check -l
+      - name: cargo clippy (warnings)
+        run: cargo clippy --all-targets -- -D warnings
+  tests-other-channels:
+    name: Tests, unstable toolchain
+    runs-on: ubuntu-latest
+    container: quay.io/coreos-assembler/fcos-buildroot:testing-devel
+    continue-on-error: true
+    strategy:
+      matrix:
+        channel: [beta, nightly]
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+      - name: Install toolchain
+        uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: ${{ matrix.channel }}
+      - name: Cache build artifacts
+        uses: Swatinem/rust-cache@v2
+      - name: cargo build
+        run: cargo build --all-targets
+      - name: cargo test
+        run: cargo test --all-targets