Build versioned image with earthly

Signed-off-by: Dimitris Karakasilis <dimitris@karakasilis.me>

Author: jimmykarily

Dockerfile

@@ -1,18 +1,16 @@
-# TODO: How should we version the image? auroraboot version + a build version?
-ARG VERSION=v0.3.2 
+ARG VERSION=v0.0.0
 ARG LUET_VERSION=0.35.5
 ARG LEAP_VERSION=15.5
 
 FROM quay.io/luet/base:$LUET_VERSION AS luet
 
 FROM golang AS builder
-ARG BINARY_VERSION=v0.0.0
 WORKDIR /work
 ADD go.mod .
 ADD go.sum .
 RUN go mod download
 ADD . .
-RUN CGO_ENABLED=0 go build -ldflags "-X main.version=${BINARY_VERSION}" -o auroraboot
+RUN CGO_ENABLED=0 go build -ldflags "-X main.version=${VERSION}" -o auroraboot
 
 FROM opensuse/leap:$LEAP_VERSION as default
 RUN zypper ref && zypper dup -y

Earthfile

@@ -5,10 +5,22 @@ ARG --global GO_VERSION=1.23-bookworm
 ARG IMAGE_VERSION=v3.2.1
 ARG --global BASE_IMAGE=quay.io/kairos/ubuntu:24.04-core-amd64-generic-${IMAGE_VERSION}-uki
 
+
+version:
+  FROM alpine
+  RUN apk update && apk add git
+
+  COPY . .
+  RUN --no-cache git describe --always --tags --dirty > VERSION
+  SAVE ARTIFACT VERSION VERSION
+
 image:
-    FROM DOCKERFILE -f Dockerfile .
+  FROM +version
+  ARG VERSION=$(cat VERSION)
+
+  FROM DOCKERFILE --build-arg VERSION=$VERSION -f Dockerfile .
 
-    SAVE IMAGE quay.io/kairos/auroraboot
+  SAVE IMAGE quay.io/kairos/auroraboot:$VERSION
 
 test-label:
     FROM alpine