feat: Add DigestUpsertRequest and LockEntity models

- Introduced DigestUpsertRequest for handling digest upsert requests with properties like ChannelId, Recipient, DigestKey, Events, and CollectUntil.
- Created LockEntity to represent a lightweight distributed lock entry with properties such as Id, TenantId, Resource, Owner, ExpiresAt, and CreatedAt.

feat: Implement ILockRepository interface and LockRepository class

- Defined ILockRepository interface with methods for acquiring and releasing locks.
- Implemented LockRepository class with methods to try acquiring a lock and releasing it, using SQL for upsert operations.

feat: Add SurfaceManifestPointer record for manifest pointers

- Introduced SurfaceManifestPointer to represent a minimal pointer to a Surface.FS manifest associated with an image digest.

feat: Create PolicySimulationInputLock and related validation logic

- Added PolicySimulationInputLock record to describe policy simulation inputs and expected digests.
- Implemented validation logic for policy simulation inputs, including checks for digest drift and shadow mode requirements.

test: Add unit tests for ReplayVerificationService and ReplayVerifier

- Created ReplayVerificationServiceTests to validate the behavior of the ReplayVerificationService under various scenarios.
- Developed ReplayVerifierTests to ensure the correctness of the ReplayVerifier logic.

test: Implement PolicySimulationInputLockValidatorTests

- Added tests for PolicySimulationInputLockValidator to verify the validation logic against expected inputs and conditions.

chore: Add cosign key example and signing scripts

- Included a placeholder cosign key example for development purposes.
- Added a script for signing Signals artifacts using cosign with support for both v2 and v3.

chore: Create script for uploading evidence to the evidence locker

- Developed a script to upload evidence to the evidence locker, ensuring required environment variables are set.

.gitea/workflows/evidence-locker.yml

@@ -25,3 +25,38 @@ jobs:
         with:
           name: evidence-locker
           path: out/evidence-locker/**
+
+  push-zastava-evidence:
+    runs-on: ubuntu-latest
+    needs: check-evidence-locker
+    env:
+      STAGED_DIR: evidence-locker/zastava/2025-12-02
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Package staged Zastava artefacts
+        run: |
+          test -d "$STAGED_DIR" || { echo "missing $STAGED_DIR" >&2; exit 1; }
+          tar -cf /tmp/zastava-evidence.tar -C "$STAGED_DIR" .
+
+      - name: Upload staged artefacts (fallback)
+        uses: actions/upload-artifact@v4
+        with:
+          name: zastava-evidence-locker-2025-12-02
+          path: /tmp/zastava-evidence.tar
+
+      - name: Push to Evidence Locker
+        if: ${{ secrets.CI_EVIDENCE_LOCKER_TOKEN != '' && env.EVIDENCE_LOCKER_URL != '' }}
+        env:
+          TOKEN: ${{ secrets.CI_EVIDENCE_LOCKER_TOKEN }}
+          URL: ${{ env.EVIDENCE_LOCKER_URL }}
+        run: |
+          curl -f -X PUT "$URL/zastava/2025-12-02/zastava-evidence.tar" \
+            -H "Authorization: Bearer $TOKEN" \
+            --data-binary @/tmp/zastava-evidence.tar
+
+      - name: Skip push (missing secret or URL)
+        if: ${{ secrets.CI_EVIDENCE_LOCKER_TOKEN == '' || env.EVIDENCE_LOCKER_URL == '' }}
+        run: |
+          echo "Locker push skipped: set CI_EVIDENCE_LOCKER_TOKEN and EVIDENCE_LOCKER_URL to enable." >&2