.gitea/workflows: upload db as artifact

.gitea/workflows/build.yml

@@ -26,3 +26,13 @@ jobs:
 
     - name: Build database
       run: nix build .#database -L
+
+    - name: Upload database as artifact
+      uses: actions/upload-artifact@v3
+      with:
+        name: jadb-${{ gitea.sha }}.zip
+        path: result/jadb.sqlite
+        if-no-files-found: error
+        retention-days: 15
+        # Already compressed
+        compression: 0