Install Redis PHP extension issue

```

42 # Install Redis PHP extension
43 RUN pecl install redis \
44 && docker-php-ext-enable redis
```

My issue have been resolved by specify release package directly.

```
RUN curl -L -o /tmp/redis.tgz \
https://pecl.php.net/get/redis-6.2.0.tgz \
&& pecl install /tmp/redis.tgz \
&& docker-php-ext-enable redis \
&& rm /tmp/redis.tgz
```

Start from the Docker build step that runs `pecl install redis` and compare it with the reporter’s pinned-package workaround. Confirm the Redis extension installation succeeds during the image build and that the resulting container enables Redis.

Written by the indexing model from the issue text.