ci(validation): replace broken action pins with direct binary installs

Two action references have been resolving to 404/marketplace-unlisted on every push since the workflow landed (commit 1fb7266 Add Oracle Aggregator and CCIP Integration), which surfaces as Prepare all required actions failures in validate-kubernetes and validate-smart-contracts before any actual validation runs.

- ludovico85/kube-score-action@v1: replaced with a direct download of kube-score v1.20.1 from the upstream zegl/kube-score release artifacts and an inline scan over k8s/base/**/*.yaml. Skips cleanly with a printed message when no manifests exist.

- crytic/[email protected].0: replaced with actions/setup-python@v5 + pip install --upgrade slither-analyzer + slither contracts --print human-summary. Trailing || true preserves the original action's non-blocking informational behaviour (the action also exited 0 on findings).

Out of scope (still failing, intentionally not silenced): validate-terraform (terraform fmt -check fails on 6 .tf files), validate-security (trivy/codeql), validate-documentation (missing CONTRIBUTING/CHANGELOG/docs/*). Those are real signals about repo health and need separate decisions.

Co-Authored-By: Nakamoto, S <[email protected]>

.github/workflows/validation.yml

@@ -59,10 +59,24 @@ jobs:
           kubectl apply --dry-run=client -f k8s/base/sentries/statefulset.yaml
           kubectl apply --dry-run=client -f k8s/base/rpc/statefulset.yaml
       
+      - name: Install kube-score
+        run: |
+          curl -sSL -o /tmp/kube-score.tar.gz \
+            https://github.com/zegl/kube-score/releases/download/v1.20.1/kube-score_1.20.1_linux_amd64.tar.gz
+          tar -xzf /tmp/kube-score.tar.gz -C /tmp
+          sudo mv /tmp/kube-score /usr/local/bin/kube-score
+          kube-score version
+
       - name: Kubernetes Security Scan
-        uses: ludovico85/kube-score-action@v1
-        with:
-          path: k8s
+        run: |
+          set -e
+          shopt -s nullglob
+          files=(k8s/base/**/*.yaml k8s/base/*.yaml)
+          if [ "${#files[@]}" -eq 0 ]; then
+            echo "No k8s manifests found under k8s/; skipping kube-score scan"
+            exit 0
+          fi
+          kube-score score "${files[@]}"
   
   validate-smart-contracts:
     runs-on: ubuntu-latest
@@ -81,10 +95,16 @@ jobs:
       - name: Check formatting
         run: forge fmt --check
       
-      - name: Smart Contract Security Scan
-        uses: crytic/[email protected]
+      - name: Set up Python
+        uses: actions/setup-python@v5
         with:
-          target: 'contracts'
+          python-version: '3.11'
+
+      - name: Install Slither
+        run: pip install --upgrade slither-analyzer
+
+      - name: Smart Contract Security Scan
+        run: slither contracts --print human-summary || true
   
   validate-security:
     runs-on: ubuntu-latest