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chore: update Dockerfile.dev-self-contained to allow better build cache #1755

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Sep 18, 2023
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7 changes: 7 additions & 0 deletions dockerfiles/Dockerfile.dev-self-contained
Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,13 @@ FROM golang:alpine as builder
# use version (for example "v0.3.3") or "main"
ARG WATCHTOWER_VERSION=main

# Pre download required modules to avoid redownloading at each build thanks to docker layer caching.
# Copying go.mod and go.sum ensure to invalid the layer/build cache if there is a change in module requirement
WORKDIR /watchtower
COPY go.mod .
COPY go.sum .
RUN go mod download

RUN apk add --no-cache \
alpine-sdk \
ca-certificates \
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