Changed makefile to be tag-aware

.gitignore

@@ -1 +1 @@
-image/Dockerfile
+image/Dockerfile-*

Makefile

@@ -28,11 +28,11 @@ prerequisites:
 format: $(wildcard $(BACKEND_PATH)/*.py) | prerequisites
 	$(PYTHON) -m yapf -i $^ --style "{based_on_style: google, column_limit: 400, indent_width: 4}"
 
-image: $(IMAGE_PATH)/Dockerfile | format $(IMAGE_SOURCES)
+image: $(IMAGE_PATH)/Dockerfile-$(IMAGE_TAG) | format $(IMAGE_SOURCES)
 	$(DOCKER) build $(IMAGE_PATH) -f $^ -t $(IMAGE_NAME)/$(IMAGE_TAG) -t $(IMAGE_NAME)/$(IMAGE_DATE_TAG) -t $(IMAGE_NAME)/$(IMAGE_LATEST_TAG)
 
 clean:
-	$(RM) $(IMAGE_PATH)/Dockerfile
+	$(RM) $(IMAGE_PATH)/*.Dockerfile
 
 test: image
 	$(DOCKER) run --rm -p 80:80 -p 443:443 $(IMAGE_NAME)/$(IMAGE_TAG)
@@ -45,7 +45,7 @@ test-bundle: bundle
 
 bundle: image $(BUNDLE_BACKEND_PATH)/app.py $(BUNDLE_BACKEND_PATH)/worker.py $(BUNDLE_FRONTEND_PATH)/index.html $(BUNDLE_FRONTEND_PATH)/application/application.css $(BUNDLE_FRONTEND_PATH)/application/application.js
 
-buildx: $(IMAGE_PATH)/Dockerfile | format $(IMAGE_SOURCES)
+buildx: $(IMAGE_PATH)/Dockerfile-$(IMAGE_TAG) | format $(IMAGE_SOURCES)
 	$(DOCKER) buildx create --use
 	$(DOCKER) buildx build $(IMAGE_PATH) --push --platform linux/386,linux/amd64,linux/arm/v5,linux/arm/v7,linux/arm64/v8 -f $^ -t $(IMAGE_NAME)/$(IMAGE_DATE_TAG) -t $(IMAGE_NAME)/$(IMAGE_LATEST_TAG)
 
@@ -61,6 +61,6 @@ $(BUNDLE_FRONTEND_PATH)/application/application.%: $(FRONTEND_PATH)/application/
 	$(MKDIR) -p $(@D)
 	$(COPY) $^ $@
 
-$(IMAGE_PATH)/Dockerfile: $(IMAGE_PATH)/Dockerfile.template | prerequisites
+$(IMAGE_PATH)/Dockerfile-$(IMAGE_TAG): $(IMAGE_PATH)/Dockerfile.template | prerequisites
 	$(MKDIR) -p $(@D)
 	$(PYTHON) -m jinja2cli.cli $^ -DBASE_IMAGE=$(BASE_IMAGE) > $@