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# syntax=docker/dockerfile:1
################################################################################
# Create a stage for building the application.
ARG GO_VERSION=1.22.5
FROM --platform=$BUILDPLATFORM golang:${GO_VERSION} AS build
WORKDIR /src
# Download dependencies as a separate step to take advantage of Docker's caching.
# Leverage a cache mount to /go/pkg/mod/ to speed up subsequent builds.
# Leverage bind mounts to go.sum and go.mod to avoid having to copy them into
# the container.
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
# This is the architecture you're building for, which is passed in by the builder.
# Placing it here allows the previous steps to be cached across architectures.
ARG TARGETARCH
# Specify the versions of the tools to use.
ARG BUF_VERSION=1.35.1
ARG MOCKGEN_VERSION=0.4.0
# Install required tools for build
RUN go install "go.uber.org/mock/mockgen@v${MOCKGEN_VERSION}" && \
curl -sSL "https://github.com/bufbuild/buf/releases/download/v${BUF_VERSION}/buf-$(uname -s)-$(uname -m)" \
-o "/usr/local/bin/buf" && \
chmod +x /usr/local/bin/buf && \
buf --version
# Bind mounts are read-only, so we copy the source code into the container.
COPY . .
# Build the application.
# Leverage a cache mount to /go/pkg/mod/ to speed up subsequent builds.
RUN --mount=type=cache,target=/go/pkg/mod/ \
go generate -v ./... && \
CGO_ENABLED=0 GOARCH=$TARGETARCH go build -o /bin/server ./cmd
################################################################################
# Create a new stage for running the application that contains the minimal
# runtime dependencies for the application. This often uses a different base
# image from the build stage where the necessary files are copied from the build
# stage.
FROM alpine:latest AS final
# Install any runtime dependencies that are needed to run your application.
# Leverage a cache mount to /var/cache/apk/ to speed up subsequent builds.
RUN --mount=type=cache,target=/var/cache/apk \
apk --update add \
ca-certificates \
tzdata \
tini \
&& \
update-ca-certificates
# Create a non-privileged user that the app will run under.
# See https://docs.docker.com/go/dockerfile-user-best-practices/
ARG UID=10001
RUN adduser \
--disabled-password \
--gecos "" \
--home "/nonexistent" \
--shell "/sbin/nologin" \
--no-create-home \
--uid "${UID}" \
appuser
USER appuser
# Copy the executable from the "build" stage.
COPY --from=build /bin/server /bin/
# Expose the port that the application listens on.
EXPOSE 8000
# What the container should run when it is started.
ENTRYPOINT ["/sbin/tini", "--"]
CMD ["/bin/server"]
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