Add SQL Server readiness check to pr-validation workflow

Co-authored-by: dlevy-msft-sql <[email protected]>

Author: Copilot

.github/workflows/pr-validation.yml

@@ -23,5 +23,14 @@ jobs:
         export SQLCMDPASSWORD=$(date +%s|sha256sum|base64|head -c 32)
         export SQLCMDUSER=sa
         docker run -m 2GB -e ACCEPT_EULA=1 -d --name sql2022 -p:1433:1433 -e SA_PASSWORD=$SQLCMDPASSWORD mcr.microsoft.com/mssql/server:2022-latest
+        echo "Waiting for SQL Server to be ready..."
+        for i in {1..60}; do
+          if docker exec sql2022 /opt/mssql-tools18/bin/sqlcmd -S localhost -U sa -P "$SQLCMDPASSWORD" -C -Q "SELECT 1" &>/dev/null; then
+            echo "SQL Server is ready!"
+            break
+          fi
+          echo "Attempt $i: SQL Server not ready yet, waiting..."
+          sleep 2
+        done
         cd ../..
         go test -v ./...