ci: add security scanning and SBOM to release pipeline

- ci.yml: add security job (gitleaks, cargo-audit, cargo-deny, trivy fs)
- release.yml: restructure into build-binary + build-docker matrix + release
  - build binary once on self-hosted, reuse across all Docker builds
  - trivy image scan per matrix variant, results to GitHub Security tab
  - SBOM generation in SPDX and CycloneDX formats attached to release
- deny.toml: cargo-deny policy (allowed licenses, banned openssl, crates.io only)
- Dockerfile: remove Rust build stage, use pre-built binary
- Dockerfile.astra, Dockerfile.redos: FROM scratch for Russian certified OS support

Dockerfile.astra

@@ -1,52 +1,17 @@
 # syntax=docker/dockerfile:1.4
+# Binary is pre-built by CI (cargo build --release) and passed via context
+# Runtime: scratch — compatible with Astra Linux SE (FSTEC certified)
+# To switch to official base: replace FROM scratch with
+#   FROM registry.astralinux.ru/library/alse:latest
+#   RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates && rm -rf /var/lib/apt/lists/*
 
-# Build stage — static binary via musl (runs on any Linux)
-FROM rust:1.83-alpine AS builder
+FROM alpine:3.20 AS certs
+RUN apk add --no-cache ca-certificates
 
-RUN apk add --no-cache musl-dev curl
-
-WORKDIR /app
-
-# Copy manifests
-COPY Cargo.toml Cargo.lock ./
-COPY nora-registry/Cargo.toml nora-registry/
-COPY nora-storage/Cargo.toml nora-storage/
-COPY nora-cli/Cargo.toml nora-cli/
-
-# Create dummy sources for dependency caching
-RUN mkdir -p nora-registry/src nora-storage/src nora-cli/src && \
-    echo "fn main() {}" > nora-registry/src/main.rs && \
-    echo "fn main() {}" > nora-storage/src/main.rs && \
-    echo "fn main() {}" > nora-cli/src/main.rs
-
-# Build dependencies only (with cache)
-RUN --mount=type=cache,target=/usr/local/cargo/registry \
-    --mount=type=cache,target=/usr/local/cargo/git \
-    --mount=type=cache,target=/app/target \
-    cargo build --release --package nora-registry && \
-    rm -rf nora-registry/src nora-storage/src nora-cli/src
-
-# Copy real sources
-COPY nora-registry/src nora-registry/src
-COPY nora-storage/src nora-storage/src
-COPY nora-cli/src nora-cli/src
-
-# Build release binary (with cache)
-RUN --mount=type=cache,target=/usr/local/cargo/registry \
-    --mount=type=cache,target=/usr/local/cargo/git \
-    --mount=type=cache,target=/app/target \
-    touch nora-registry/src/main.rs && \
-    cargo build --release --package nora-registry && \
-    cp /app/target/release/nora /usr/local/bin/nora
-
-# Runtime stage — scratch (compatible with Astra Linux SE, no foreign OS components)
-# Switch FROM to registry.astralinux.ru/library/alse once registry access is configured
 FROM scratch
 
-# CA certificates for TLS
-COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
-
-COPY --from=builder /usr/local/bin/nora /usr/local/bin/nora
+COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
+COPY nora /usr/local/bin/nora
 
 ENV RUST_LOG=info
 ENV NORA_HOST=0.0.0.0