FROM golang:1.22.5-alpine3.20 AS builder

# Create appuser.
ENV USER=appuser
ENV UID=10001

RUN adduser \
    --disabled-password \
    --gecos "" \
    --home "/nonexistent" \
    --shell "/sbin/nologin" \
    --no-create-home \
    --uid "${UID}" \
    "${USER}"

WORKDIR $GOPATH/src/avatars/
COPY . .

# Fetch dependencies.
RUN go mod download
RUN go mod verify

# Build the binary.
RUN CGO_ENABLED=0 go build -ldflags="-w -s" -o /go/bin/avatars

############################
# STEP 2 build a small image
############################
FROM scratch

# Import the user and group files from the builder.
COPY --from=builder /etc/passwd /etc/passwd
COPY --from=builder /etc/group /etc/group

# Copy our static executable.
COPY --from=builder /go/bin/avatars /go/bin/avatars

# Set Work directory for relative paths of assets
# WORKDIR /go/bin

# Expose API Port
EXPOSE 3382

# Use an unprivileged user.
USER appuser:appuser

# Run the hello binary.
ENTRYPOINT ["/go/bin/avatars"]