wip: add image target

Signed-off-by: Robert Günzler <robertg@balena.io>

Dockerfile

@@ -331,3 +331,26 @@ COPY --from=build-cross /build/bundles/ /
 FROM dev AS final
 # Upload docker source
 COPY . /go/src/github.com/docker/docker
+
+
+# balena-engine minimal image target
+FROM --platform=${TARGETPLATFORM} alpine:3 AS image
+
+ARG MAINTAINER="Robert Günzler <robertg@balena.io>"
+ARG SOURCE="https://github.com/balena-os/balena-engine"
+ARG VERSION
+LABEL \
+    maintainer=${MAINTAINER} \
+    org.opencontainers.image.source=${SOURCE} \
+    org.opencontainers.image.version=${VERSION}
+
+RUN groupadd -r balena-engine
+RUN apk add --no-cache \
+	curl \
+	htop \
+	iptables \
+	openssl \
+	util-linux
+
+ARG TARGETPLATFORM
+COPY --from=cross /cross/${TARGETPLATFORM}/* /usr/local/bin/