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

.github/workflows/release.yml

@@ -9,12 +9,36 @@ env:
   IMAGE_NAME: ${{ github.repository }}
 
 jobs:
-  build:
+  build-binary:
+    name: Build Binary
+    runs-on: self-hosted
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Rust
+        run: echo "/home/ai-user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/bin" >> $GITHUB_PATH
+
+      - name: Build release binary
+        run: |
+          RUSTUP_HOME=/home/ai-user/.rustup cargo build --release --package nora-registry
+          cp target/release/nora ./nora
+
+      - name: Upload binary
+        uses: actions/upload-artifact@v4
+        with:
+          name: nora-binary
+          path: nora
+          retention-days: 1
+
+  build-docker:
     name: Build & Push (${{ matrix.name }})
     runs-on: self-hosted
+    needs: build-binary
     permissions:
       contents: read
       packages: write
+      security-events: write  # for uploading SARIF to GitHub Security tab
 
     strategy:
       fail-fast: false
@@ -33,6 +57,14 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Download binary
+        uses: actions/download-artifact@v4
+        with:
+          name: nora-binary
+
+      - name: Make binary executable
+        run: chmod +x nora
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
@@ -68,20 +100,64 @@ jobs:
           cache-from: type=gha,scope=${{ matrix.name }}
           cache-to: type=gha,mode=max,scope=${{ matrix.name }}
 
+      # ── CVE scan of the pushed image ────────────────────────────────────────
+      - name: Trivy — image scan
+        uses: aquasecurity/trivy-action@master
+        with:
+          scan-type: image
+          image-ref: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.meta.outputs.version }}${{ matrix.suffix }}
+          format: sarif
+          output: trivy-image-${{ matrix.name }}.sarif
+          severity: HIGH,CRITICAL
+          exit-code: 0  # warn only; change to 1 to block on vulnerabilities
+
+      - name: Upload Trivy image results to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@v3
+        if: always()
+        with:
+          sarif_file: trivy-image-${{ matrix.name }}.sarif
+          category: trivy-image-${{ matrix.name }}
+
   release:
     name: GitHub Release
     runs-on: ubuntu-latest
-    needs: build
+    needs: build-docker
     permissions:
       contents: write
+      packages: read  # to pull image for SBOM generation
 
     steps:
       - uses: actions/checkout@v4
 
+      - name: Log in to Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      # ── SBOM — Software Bill of Materials ───────────────────────────────────
+      - name: Generate SBOM (SPDX)
+        uses: anchore/sbom-action@v0
+        with:
+          image: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.ref_name }}
+          format: spdx-json
+          output-file: nora-${{ github.ref_name }}.sbom.spdx.json
+
+      - name: Generate SBOM (CycloneDX)
+        uses: anchore/sbom-action@v0
+        with:
+          image: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.ref_name }}
+          format: cyclonedx-json
+          output-file: nora-${{ github.ref_name }}.sbom.cdx.json
+
       - name: Create Release
         uses: softprops/action-gh-release@v1
         with:
           generate_release_notes: true
+          files: |
+            nora-${{ github.ref_name }}.sbom.spdx.json
+            nora-${{ github.ref_name }}.sbom.cdx.json
           body: |
             ## Docker