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Improve Docker layer caching for Go dependencies (#560)

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Running `go mod download` before copying the entire project to the
Docker image avoids dependencies from being re-downloaded every time any
file is modified, and `docker build` runs again.

This follows the steps detailed in the official Docker guide for Go
images:
https://docs.docker.com/language/golang/build-images/#create-a-dockerfile-for-the-application

Also, `GO111MODULE` doesn't make any difference for the supported
Go versions, so it can be removed from the Dockerfile.
This commit is contained in:
Michael Manganiello 2023-05-22 23:54:02 -03:00 committed by GitHub
parent bafbf0c1a0
commit a653181ea8
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1 changed files with 5 additions and 3 deletions
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@ -5,11 +5,13 @@ FROM golang:${GO_VERSION}-alpine as build
# Necessary to run 'go get' and to compile the linked binary
RUN apk add git musl-dev mailcap
ADD . /go/src/github.com/dutchcoders/transfer.sh
WORKDIR /go/src/github.com/dutchcoders/transfer.sh
ENV GO111MODULE=on
COPY go.mod go.sum ./
RUN go mod download
COPY . .
# build & install server
RUN CGO_ENABLED=0 go build -tags netgo -ldflags "-X github.com/dutchcoders/transfer.sh/cmd.Version=$(git describe --tags) -a -s -w -extldflags '-static'" -o /go/bin/transfersh