ci: add submodules and contract build for generate-compat-db

Building katana requires the contract artifacts from `make contracts`,
which in turn requires the submodules (contracts sources). Mirror the
same setup used by the generate-migration-dbs job.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: kariy

.github/workflows/generate-db-dispatch.yml

@@ -13,6 +13,8 @@ jobs:
             ASDF_SOZO_VERSION: "1.7.0"
         steps:
             - uses: actions/checkout@v4
+              with:
+                  submodules: recursive
 
             # Workaround for https://github.com/actions/runner-images/issues/6775
             - run: git config --global --add safe.directory "*"
@@ -22,6 +24,9 @@ jobs:
               with:
                   scarb-version: "2.10.1"
 
+            - name: Build contracts
+              run: make contracts
+
             - name: Build katana
               run: cargo build --bin katana --release