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Add example Dockerfile (#18427) 

* Add example Dockerfile

* Align with action

* Update cache.md
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Matthias Gubler 2023-10-24 07:44:08 -06:00 committed by GitHub
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@ -145,6 +145,22 @@ cache mount data with your Docker build steps.
The following example shows how to use this workaround with a Go project.
Example Dockerfile in `build/package/Dockerfile`
```Dockerfile
FROM golang:1.21.1-alpine as base-build
WORKDIR /build
RUN go env -w GOMODCACHE=/root/.cache/go-build
COPY go.mod go.sum ./
RUN --mount=type=cache,target=/root/.cache/go-build go mod download
COPY ./src ./
RUN --mount=type=cache,target=/root/.cache/go-build && go build -o /bin/app /build/src
...
```
Example CI action
```yaml
name: ci
on: push