Fix CI: wait for PostGIS extension before schema push

pg_isready reports true before PostGIS extension is initialized.
Added a second wait loop that queries PostGIS_Version() to ensure
the extension is fully loaded before running drizzle-kit push.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -102,11 +102,16 @@ jobs:
             -e POSTGRES_DB=trails \
             -p 5432:5432 \
             postgis/postgis:16-3.4
-          # Wait for health
+          # Wait for pg_isready
           for i in $(seq 1 30); do
             docker exec postgres pg_isready -U trails > /dev/null 2>&1 && break
             sleep 1
           done
+          # Wait for PostGIS extension to be ready
+          for i in $(seq 1 10); do
+            docker exec postgres psql -U trails -c "SELECT PostGIS_Version();" > /dev/null 2>&1 && break
+            sleep 1
+          done
 
       - name: Push database schema
         run: pnpm db:push