ci: add database services for MSSQL testing

Add PostgreSQL, MySQL, and MSSQL as GitHub Actions services so they're
ready before tests run. This avoids the timeout issues from pulling the
large MSSQL image (~1.5GB) during test execution.

Set environment variables so tests use the pre-started service databases
instead of trying to start their own containers.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: claude

.github/workflows/ci.yml

@@ -24,6 +24,33 @@ jobs:
         GOARCH: ${{ matrix.goarch }}
   test:
     runs-on: ubuntu-24.04
+    services:
+      postgres:
+        image: postgres:16
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: mysecretpassword
+          POSTGRES_DB: postgres
+        ports:
+          - 5432:5432
+        options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
+      mysql:
+        image: mysql:9
+        env:
+          MYSQL_DATABASE: dinotest
+          MYSQL_ROOT_PASSWORD: mysecretpassword
+          MYSQL_ROOT_HOST: '%'
+        ports:
+          - 3306:3306
+        options: --health-cmd="mysqladmin ping" --health-interval=10s --health-timeout=5s --health-retries=5
+      mssql:
+        image: mcr.microsoft.com/mssql/server:2022-latest
+        env:
+          ACCEPT_EULA: Y
+          MSSQL_SA_PASSWORD: MySecretPassword1!
+          MSSQL_PID: Developer
+        ports:
+          - 1433:1433
     steps:
     - uses: actions/checkout@v6
     - uses: actions/setup-go@v6
@@ -58,6 +85,9 @@ jobs:
         CI_SQLC_AUTH_TOKEN: ${{ secrets.CI_SQLC_AUTH_TOKEN }}
         SQLC_AUTH_TOKEN: ${{ secrets.CI_SQLC_AUTH_TOKEN }}
         CGO_ENABLED: "0"
+        POSTGRESQL_SERVER_URI: "postgres://postgres:mysecretpassword@localhost:5432/postgres?sslmode=disable"
+        MYSQL_SERVER_URI: "root:mysecretpassword@tcp(localhost:3306)/dinotest?parseTime=true"
+        MSSQL_SERVER_URI: "sqlserver://sa:MySecretPassword1!@localhost:1433?database=master"
 
   vuln_check:
     runs-on: ubuntu-24.04