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Dockerfile
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# syntax=docker/dockerfile:1
ARG app_dir="/home/go/app"
# * Building the application
FROM golang:1.22-alpine3.20 AS build
ARG app_dir
WORKDIR ${app_dir}
RUN --mount=type=cache,target=/go/pkg/mod/ \
--mount=type=bind,source=go.sum,target=go.sum \
--mount=type=bind,source=go.mod,target=go.mod \
go mod download -x
COPY . .
ARG BUILD_STRING=pretendo.ironfallinvasion.docker
RUN --mount=type=cache,target=/go/pkg/mod/ \
CGO_ENABLED=0 go build -ldflags "-X 'main.serverBuildString=${BUILD_STRING}'" -v -o ${app_dir}/build/server
# * Running the final application
FROM alpine:3.20 AS final
ARG app_dir
WORKDIR ${app_dir}
RUN addgroup go && adduser -D -G go go
RUN mkdir -p ${app_dir}/log && chown go:go ${app_dir}/log
USER go
COPY --from=build ${app_dir}/build/server ${app_dir}/server
CMD [ "./server" ]