fix: validate config file extension before use #1311

	name: pr-validation

	on:
	pull_request:
	branches:
	- main

	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v6
	- name: Setup go
	uses: actions/setup-go@v6
	with:
	go-version: '1.24'
	- name: Run tests against Linux SQL
	run: \|
	go version
	cd cmd/sqlcmd
	go get -d
	go build .
	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..."
	READY=0
	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!"
	READY=1
	break
	fi
	echo "Attempt $i: SQL Server not ready yet, waiting..."
	sleep 2
	done
	if [ $READY -eq 0 ]; then
	echo "ERROR: SQL Server failed to become ready within 2 minutes"
	exit 1
	fi
	cd ../..
	go test -v ./...

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