suggest change another example in readme

[huahuayu]

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• [X] I could not find a solution in the existing issues, docs, nor discussions.
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Describe your problem

The example can't be run in mac m1, because of the mysql5.7 docker image problem.

Describe your ideal solution

Maybe it's better to use another use case or image which don't have compatibility issue. , AFAIK postgres image works fine in both intel & arm arch.

Workarounds or alternatives

I tried to use arm64v8/mysql:8 no lucky

Version

https://github.com/ory/dockertest/commit/5e64d1ad5af5253d65cc8684f1ce4e7ed6d52412

Additional Context

No response

[huahuayu]

This snippet works

package dockertest_test

import (
	"context"
	"fmt"
	"github.com/go-redis/redis/v8"
	"github.com/ory/dockertest/v3"
	"log"
	"os"
	"testing"
)

var db *redis.Client

func TestMain(m *testing.M) {
	// uses a sensible default on windows (tcp/http) and linux/osx (socket)
	pool, err := dockertest.NewPool("")
	if err != nil {
		log.Fatalf("Could not connect to docker: %s", err)
	}

	// pulls an image, creates a container based on it and runs it
	resource, err := pool.Run("redis", "latest", nil)
	if err != nil {
		log.Fatalf("Could not start resource: %s", err)
	}

	// exponential backoff-retry, because the application in the container might not be ready to accept connections yet
	if err = pool.Retry(func() error {
		db = redis.NewClient(&redis.Options{
			Addr: fmt.Sprintf("localhost:%s", resource.GetPort("6379/tcp")),
		})
		return db.Ping(context.Background()).Err()
	}); err != nil {
		log.Fatalf("Could not connect to docker: %s", err)
	}

	code := m.Run()

	// When you're done, kill and remove the container, you can't defer this because os.Exit doesn't care for defer
	if err = pool.Purge(resource); err != nil {
		log.Fatalf("Could not purge resource: %s", err)
	}

	os.Exit(code)
}

func TestSomething(t *testing.T) {
	db.Set(context.Background(), "k0", "v0", 0)
	val, err := db.Get(context.Background(), "k0").Result()
	log.Println(val, err)
}

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