Merge pull request #246 from yannoff/documentation/warn-on-cached-image-pitfall-when-using-copy
[documentation] Add caveat on COPY cached imagepull/251/head
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b143e8f116
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README.md
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README.md
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@ -37,6 +37,17 @@ COPY --from=mlocati/php-extension-installer /usr/bin/install-php-extensions /usr
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RUN install-php-extensions gd xdebug
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```
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#### *Beware*
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*When building locally, be sure you have the latest version of the `mlocati/php-extension-installer` image by running :*
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```sh
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docker pull mlocati/php-extension-installer
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```
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*otherwise the `COPY` instruction could use a previously downloaded, outdated version of the image stored in the local docker cache.*
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### Installing a specific version of an extension
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Simply append `-<version>` to the module name.
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