use nginx when possible when writing test

We have to do our best to keep the number of images overall the test
suite as small as possible, to speed up the testsuite itself.

container_test.go

@@ -319,12 +319,9 @@ func TestShouldStartContainersInParallel(t *testing.T) {
 
 func createTestContainer(t *testing.T, ctx context.Context) int {
 	req := ContainerRequest{
-		Image:        "localstack/localstack:latest",
-		ExposedPorts: []string{"4584/tcp", "8080/tcp"},
-		Env: map[string]string{
-			"SERVICES": "secretsmanager",
-		},
-		WaitingFor: wait.ForListeningPort("4584/tcp"),
+		Image:        "nginx",
+		ExposedPorts: []string{"80/tcp"},
+		WaitingFor:   wait.ForHTTP("/"),
 	}
 	container, err := GenericContainer(ctx, GenericContainerRequest{
 		ContainerRequest: req,
@@ -333,7 +330,7 @@ func createTestContainer(t *testing.T, ctx context.Context) int {
 	if err != nil {
 		t.Fatalf("could not start container: %v", err)
 	}
-	port, err := container.MappedPort(ctx, "4584")
+	port, err := container.MappedPort(ctx, "80")
 	if err != nil {
 		t.Fatalf("could not get mapped port: %v", err)
 	}