chore: import upstream snapshot with attribution

.github/actions/build-rustnet/action.yml

@@ -0,0 +1,38 @@
+name: 'Build RustNet'
+description: 'Build RustNet binary for a specific target'
+
+inputs:
+  target:
+    description: 'Rust target triple (e.g., x86_64-unknown-linux-gnu)'
+    required: true
+  cargo-command:
+    description: 'Cargo command to use (cargo or cross)'
+    required: false
+    default: 'cargo'
+  default-features:
+    description: 'Enable default features including eBPF (true/false)'
+    required: false
+    default: 'true'
+  strip-symbols:
+    description: 'Strip debug symbols from binary (true/false)'
+    required: false
+    default: 'true'
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Build binary
+      shell: bash
+      env:
+        RUSTFLAGS: ${{ inputs.strip-symbols == 'true' && '-C strip=symbols' || '' }}
+      run: |
+        mkdir -p assets  # Ensure asset dir exists for build.rs
+
+        BUILD_CMD="${{ inputs.cargo-command }} build --verbose --release --target ${{ inputs.target }}"
+
+        if [[ "${{ inputs.default-features }}" != "true" ]]; then
+          BUILD_CMD="$BUILD_CMD --no-default-features"
+        fi
+
+        echo "Running: $BUILD_CMD"
+        $BUILD_CMD

.github/actions/build-static/action.yml

@@ -0,0 +1,30 @@
+name: 'Build Static Binary'
+description: 'Build a statically-linked Linux binary using musl'
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Install dependencies
+      shell: sh
+      run: |
+        apk add --no-cache \
+          musl-dev libpcap-dev pkgconfig build-base perl \
+          elfutils-dev zlib-dev zlib-static zstd-dev zstd-static \
+          clang llvm linux-headers git
+        rustup component add rustfmt
+
+    - name: Build static binary
+      shell: sh
+      env:
+        # -C strip=symbols: Strip debug symbols for smaller binary
+        # -C link-arg=-l:libzstd.a: Fix elfutils 0.189+ zstd dependency (libbpf/bpftool#152)
+        RUSTFLAGS: "-C strip=symbols -C link-arg=-l:libzstd.a"
+      run: cargo build --release
+
+    - name: Verify static linking
+      shell: sh
+      run: |
+        file target/release/rustnet
+        # Use file command to verify (ldd behaves differently inside Alpine)
+        file target/release/rustnet | grep -q "static.* linked" || \
+          (echo "ERROR: Binary is not statically linked" && exit 1)

.github/actions/setup-linux-deps/action.yml

@@ -0,0 +1,11 @@
+name: 'Setup Linux Build Dependencies'
+description: 'Install dependencies required for building RustNet on Linux'
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Install dependencies
+      shell: bash
+      run: |
+        sudo apt-get update -y
+        sudo apt-get install -y libpcap-dev libelf-dev zlib1g-dev clang llvm pkg-config