packaging: remove unused Dockerfile.alpine (#2470)

It was introduced by #762 and its usage was removed by #779 Fixes #2468 Signed-off-by: Alexander Yastrebov <alexander.yastrebov@zalando.de>
zalando · Jul 18, 2023 · 9704ab9 · 9704ab9
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diff --git a/packaging/Dockerfile.alpine b/packaging/Dockerfile.alpine
diff --git a/packaging/Makefile b/packaging/Makefile
@@ -6,7 +6,6 @@ BINARIES           ?= skipper webhook eskip routesrv
 IMAGE              ?= $(REGISTRY)/skipper:$(VERSION)
 ARM64_IMAGE        ?= $(REGISTRY)/skipper-arm64:$(VERSION)
 ARM_IMAGE          ?= $(REGISTRY)/skipper-armv7:$(VERSION)
-ALPINE_BUILD_IMAGE ?= $(REGISTRY)/skipper-alpine-build:latest
 PACKAGE            ?= github.com/zalando/skipper
 CGO_ENABLED        ?= 0
 GOOS               ?= linux