ci: run cargo deny in build workflow

Adds a cargo-deny step (EmbarkStudios/cargo-deny-action@v2)
  after clippy and fmt, gated to the rust-toolchain matrix channel only.
  Wires the outcome into the existing failure summary table.

.github/workflows/build.yml

@@ -188,6 +188,15 @@ jobs:
       # End Run cargo fmt
 
 
+      # Run cargo deny (supply-chain: advisories, licenses, bans, sources)
+      # Only run on rust-toolchain channel — deny.toml pins the feature set.
+      - name: "cargo deny"
+        id: deny
+        if: ${{ !cancelled() && matrix.channel == 'rust-toolchain' }}
+        uses: EmbarkStudios/cargo-deny-action@3fd3802e88374d3fe9159b834c7714ec57d6c979 # v2
+      # End Run cargo deny
+
+
       # Check for any previous failures, if there are stop, else continue.
       # This is useful so all test/clippy/fmt actions are done, and they can all be addressed
       - name: "Some checks failed"
@@ -201,6 +210,7 @@ jobs:
           TEST_POSTGRESQL: ${{ steps.test_postgresql.outcome }}
           CLIPPY: ${{ steps.clippy.outcome }}
           FMT: ${{ steps.formatting.outcome }}
+          DENY: ${{ steps.deny.outcome }}
         run: |
           echo "### :x: Checks Failed!" >> "${GITHUB_STEP_SUMMARY}"
           echo "" >> "${GITHUB_STEP_SUMMARY}"
@@ -214,6 +224,7 @@ jobs:
           echo "|test (postgresql)|${TEST_POSTGRESQL}|" >> "${GITHUB_STEP_SUMMARY}"
           echo "|clippy (sqlite,mysql,postgresql,enable_mimalloc,s3)|${CLIPPY}|" >> "${GITHUB_STEP_SUMMARY}"
           echo "|fmt|${FMT}|" >> "${GITHUB_STEP_SUMMARY}"
+          echo "|cargo deny|${DENY}|" >> "${GITHUB_STEP_SUMMARY}"
           echo "" >> "${GITHUB_STEP_SUMMARY}"
           echo "Please check the failed jobs and fix where needed." >> "${GITHUB_STEP_SUMMARY}"
           echo "" >> "${GITHUB_STEP_SUMMARY}"