Fixing the build command (#128)

Author: ahg-g

Dockerfile

@@ -1,5 +1,5 @@
 ## Multistage build
-FROM golang:1.23-alpine as build
+FROM golang:1.23-alpine AS build
 ENV CGO_ENABLED=0
 ENV GOOS=linux
 ENV GOARCH=amd64

Makefile

@@ -22,7 +22,7 @@ SHELL = /usr/bin/env bash -o pipefail
 .SHELLFLAGS = -ec
 
 GIT_TAG ?= $(shell git describe --tags --dirty --always)
-PLATFORMS ?= linux/amd64,linux/arm64
+PLATFORMS ?= linux/amd64
 DOCKER_BUILDX_CMD ?= docker buildx
 IMAGE_BUILD_CMD ?= $(DOCKER_BUILDX_CMD) build
 IMAGE_BUILD_EXTRA_OPTS ?=
@@ -36,6 +36,13 @@ IMAGE_TAG ?= $(IMAGE_REPO):$(GIT_TAG)
 BASE_IMAGE ?= gcr.io/distroless/static:nonroot
 BUILDER_IMAGE ?= golang:$(GO_VERSION)
 
+ifdef EXTRA_TAG
+IMAGE_EXTRA_TAG ?= $(IMAGE_REPO):$(EXTRA_TAG)
+endif
+ifdef IMAGE_EXTRA_TAG
+IMAGE_BUILD_EXTRA_OPTS += -t $(IMAGE_EXTRA_TAG)
+endif
+
 ##@ General
 
 # The help target prints out all targets with their descriptions organized