[Bug]: Postgres SSL mode not respected

[bearrito]

Testcontainers version

latest

Using the latest Testcontainers version?

Yes

Host OS

Linux

Host arch

x86

Go version

go version go1.21.4 linux/amd64

Docker version

Client:
 Version:           24.0.5
 API version:       1.43
 Go version:        go1.20.3
 Git commit:        24.0.5-0ubuntu1~22.04.1
 Built:             Mon Aug 21 19:50:14 2023
 OS/Arch:           linux/amd64
 Context:           default

Server:
 Engine:
  Version:          24.0.5
  API version:      1.43 (minimum version 1.12)
  Go version:       go1.20.3
  Git commit:       24.0.5-0ubuntu1~22.04.1
  Built:            Mon Aug 21 19:50:14 2023
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.7.2
  GitCommit:        
 runc:
  Version:          1.1.7-0ubuntu1~22.04.1
  GitCommit:        
 docker-init:
  Version:          0.19.0
  GitCommit:

### Docker info

```shell
Client:
 Version:    24.0.5
 Context:    default
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.11.2
    Path:     /usr/libexec/docker/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  v2.21.0
    Path:     /usr/libexec/docker/cli-plugins/docker-compose

Server:
 Containers: 14
  Running: 0
  Paused: 0
  Stopped: 14
 Images: 26
 Server Version: 24.0.5
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Using metacopy: false
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: systemd
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 
 runc version: 
 init version: 
 Security Options:
  apparmor
  seccomp
   Profile: builtin
  cgroupns
 Kernel Version: 6.2.0-39-generic
 Operating System: Ubuntu 22.04.3 LTS
 OSType: linux
 Architecture: x86_64
 CPUs: 16
 Total Memory: 31.06GiB
 Name: LOCLAP680
 ID: 948cea59-d9c6-4abb-8997-b1535035dd87
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false

### What happened?

The tests passes when it should not.

### Relevant log output

```shell
N/A

Additional information

I was looking at implementing SSL for Postgres in relation to #2404

This tests passes but should not since ssl=require should not work

func TestWithSSLEnabledConfigFile(t *testing.T) {
	ctx := context.Background()

	container, err := postgres.RunContainer(ctx,
		postgres.WithConfigFile(filepath.Join("testdata", "my-postgres.conf")),
		postgres.WithDatabase(dbname),
		postgres.WithUsername(user),
		postgres.WithPassword(password),
		testcontainers.WithWaitStrategy(wait.ForLog("database system is ready to accept connections").WithOccurrence(2).WithStartupTimeout(5*time.Second)),
	)
	if err != nil {
		t.Fatal(err)
	}

	t.Cleanup(func() {
		if err := container.Terminate(ctx); err != nil {
			t.Fatalf("failed to terminate container: %s", err)
		}
	})

	// explicitly set sslmode=disable because the container is not configured to use TLS
	connStr, err := container.ConnectionString(ctx, "sslmode=require")
	require.NoError(t, err)

	db, err := sql.Open("postgres", connStr)
	require.NoError(t, err)
	assert.NotNil(t, db)
	defer db.Close()
}