diff --git a/packaging/Dockerfile b/packaging/Dockerfile
index bc684fe..46e86c9 100644
--- a/packaging/Dockerfile
+++ b/packaging/Dockerfile
@@ -13,7 +13,7 @@ RUN echo "${BUILD_USER} ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers
 ARG KEYFILE
 COPY ${KEYFILE}.pub /etc/apk/keys/.
 RUN mkdir -p /home/${BUILD_USER}/.abuild/
-RUN echo "PACKAGER_PRIVKEY=/home/${BUILD_USER}/.abuild/signing-key.rsa" >> /home/${BUILD_USER}/.abuild/abuild.conf
+RUN echo "PACKAGER_PRIVKEY=/home/${BUILD_USER}/.abuild/${KEYFILE}" >> /home/${BUILD_USER}/.abuild/abuild.conf
 
 USER ${BUILD_USER}
 WORKDIR /data
diff --git a/packaging/Makefile b/packaging/Makefile
index bece57b..28b7851 100644
--- a/packaging/Makefile
+++ b/packaging/Makefile
@@ -15,7 +15,7 @@ endif
 
 ARCH?=aarch64
 DOCKER_ARCH=$(shell ./map_docker_arch.sh $(ARCH))
-KEYFILE?=$(CURDIR)/synit-apk-key
+KEYFILE?=synit-apk-key
 UID:=$(shell id -u)
 GID:=$(shell id -g)
 BUILD_USER?=build
@@ -25,17 +25,18 @@ DOCKER_CMD=\
 	docker run --platform linux/$(DOCKER_ARCH) -it --rm \
 		$(DOCKER_SQUID_OPTS) \
 		-v `pwd`:/data \
-		-v $(KEYFILE):/home/$(BUILD_USER)/.abuild/signing-key.rsa \
+		-v `pwd`/$(KEYFILE):/home/$(BUILD_USER)/.abuild/$(KEYFILE) \
 		-v $(CURDIR)/distfiles:/var/cache/distfiles \
 		synit-build:$(ARCH)
 
 build: build-image
-	$(DOCKER_CMD) make -f Makefile.internal build
-
+	$(DOCKER_CMD) make -f Makefile.internal $@ KEYFILE=$(KEYFILE)
 sign: build-image
-	$(DOCKER_CMD) make -f Makefile.internalsign
-
-%.apk:
+	$(DOCKER_CMD) make -f Makefile.internal $@ KEYFILE=$(KEYFILE)
+%.apk: build-image
+	$(DOCKER_CMD) make -f Makefile.internal $@ KEYFILE=$(KEYFILE)
+%.checksum: build-image
+	$(DOCKER_CMD) make -f Makefile.internal $@ KEYFILE=$(KEYFILE)
 
 clean:
 	rm -f .build-image.*
@@ -53,7 +54,7 @@ build-image: .build-image.$(ARCH)
 		--platform=linux/$(DOCKER_ARCH) \
 		--build-arg http_proxy=$(HTTP_PROXY) \
 		--build-arg DOCKER_ARCH=$(DOCKER_ARCH) \
-		--build-arg KEYFILE=$(KEYFILE:$(abspath $(dir $(KEYFILE)))/%=%) \
+		--build-arg KEYFILE=$(KEYFILE) \
 		--build-arg UID=$(UID) \
 		--build-arg BUILD_USER=$(BUILD_USER) \
 		-t synit-build:$(ARCH) .
@@ -63,6 +64,6 @@ keyfile: $(KEYFILE)
 
 $(KEYFILE):
 	docker run -it --rm \
-		-v $(abspath $(dir $(KEYFILE))):/data \
+		-v `pwd`:/data \
 		alpine \
-		sh -c "apk add abuild && echo /data/$(notdir $(KEYFILE)) | abuild-keygen && chown $(UID):$(GID) /data/$(notdir $(KEYFILE))*"
+		sh -c "apk add abuild && echo /data/$(KEYFILE) | abuild-keygen && chown $(UID):$(GID) /data/$(KEYFILE)*"
diff --git a/packaging/Makefile.internal b/packaging/Makefile.internal
index 54a0c43..cd524db 100644
--- a/packaging/Makefile.internal
+++ b/packaging/Makefile.internal
@@ -5,7 +5,7 @@
 TARGET = $(CURDIR)/target
 ARCH = $(shell apk --print-arch)
 ARCH_TARGET = $(TARGET)/packages/$(ARCH)
-SIGNING_KEY = $(HOME)/.abuild/signing-key.rsa
+SIGNING_KEY = $(HOME)/.abuild/$(KEYFILE)
 
 PACKAGES = \
 	squeak-vm.apk \
@@ -13,8 +13,6 @@ PACKAGES = \
 build: $(PACKAGES) sign
 
 %.apk: $(ARCH_TARGET)
-	@echo proxy $$http_proxy
-	@cat ~/.abuild/abuild.conf
 	@echo "Building $*..."
 	@cd packages/$* && (unset MAKEFLAGS; abuild -F -P $(TARGET) deps && abuild -P $(TARGET))
 
@@ -27,7 +25,7 @@ $(ARCH_TARGET):
 sign: $(ARCH_TARGET)
 	rm -f $(ARCH_TARGET)/APKINDEX.tar.gz
 	cd $(ARCH_TARGET) && apk index -o APKINDEX.tar.gz --rewrite-arch $(ARCH) *.apk
-	abuild-sign -q -k $(HOME)/.abuild/signing-key.rsa $(ARCH_TARGET)/APKINDEX.tar.gz
+	abuild-sign -q -k $(SIGNING_KEY) $(ARCH_TARGET)/APKINDEX.tar.gz
 
 clean: