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docs: document dockerignore update 

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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Tonis Tiigi 2019-05-24 12:07:52 -07:00 committed by Sebastiaan van Stijn
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docs/reference/commandline/build.md
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@ -324,7 +324,16 @@ Successfully built 99cc1ad10469
This example shows the use of the `.dockerignore` file to exclude the `.git`
directory from the context. Its effect can be seen in the changed size of the
uploaded context. The builder reference contains detailed information on
[creating a .dockerignore file](../builder.md#dockerignore-file)
[creating a .dockerignore file](../builder.md#dockerignore-file).
When using the [BuildKit backend](../builder.md#buildkit), `docker build` searches
for a `.dockerignore` file relative to the Dockerfile name. For example, running
`docker build -f myapp.Dockerfile .` will first look for an ignore file named
`myapp.Dockerfile.dockerignore`. If such a file is not found, the `.dockerignore`
file is used if present. Using a Dockerfile based `.dockerignore` is useful if a
project contains multiple Dockerfiles that expect to ignore different sets of
files.
### Tag an image (-t)