From d51c7b818d99bf8db601e54c0361bd96d6588d90 Mon Sep 17 00:00:00 2001
From: Yannoff <yannoff.it@gmail.com>
Date: Sun, 10 Jan 2021 20:32:31 +0100
Subject: [PATCH] [documentation] Add caveat on COPY cached image

- Add a caveat on cached image pitfall in the `COPY` section of the `README`
---
 README.md | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/README.md b/README.md
index eb8ddcd..51ced73 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,17 @@ COPY --from=mlocati/php-extension-installer /usr/bin/install-php-extensions /usr
 RUN install-php-extensions gd xdebug
 ```
 
+#### *Beware*
+
+*When building locally, be sure you have the latest version of the `mlocati/php-extension-installer` image by running :*
+
+```sh
+docker pull mlocati/php-extension-installer
+```
+
+*otherwise the `COPY` instruction could use a previously downloaded, outdated version of the image stored in the local docker cache.*
+
+
 ### Installing a specific version of an extension
 
 Simply append `-<version>` to the module name.