Make host mount prefix configurable in Makefile and Dockerfile

Introduce a new makefile variable and dockerfile build arg named
HOSTMOUNT_PREFIX for changing the prefix used for mounting host
directories inside the container. Adds a sed rule in Makefile to
generate deployment yamls accordingly.

Dockerfile

@@ -12,9 +12,10 @@ RUN go mod download
 COPY . /go/node-feature-discovery
 
 ARG NFD_VERSION
+ARG HOSTMOUNT_PREFIX
 
 RUN go install \
-  -ldflags "-s -w -X sigs.k8s.io/node-feature-discovery/pkg/version.version=$NFD_VERSION -X sigs.k8s.io/node-feature-discovery/source.pathPrefix=/host-" \
+  -ldflags "-s -w -X sigs.k8s.io/node-feature-discovery/pkg/version.version=$NFD_VERSION -X sigs.k8s.io/node-feature-discovery/source.pathPrefix=$HOSTMOUNT_PREFIX" \
   ./cmd/*
 RUN install -D -m644 nfd-worker.conf.example /etc/kubernetes/node-feature-discovery/nfd-worker.conf
 

Makefile

@@ -16,6 +16,7 @@ IMAGE_TAG_NAME := $(VERSION)
 IMAGE_REPO := $(IMAGE_REGISTRY)/$(IMAGE_NAME)
 IMAGE_TAG := $(IMAGE_REPO):$(IMAGE_TAG_NAME)
 K8S_NAMESPACE := kube-system
+HOSTMOUNT_PREFIX := /host-
 KUBECONFIG :=
 E2E_TEST_CONFIG :=
 
@@ -26,6 +27,7 @@ all: image
 
 image: yamls
 	$(IMAGE_BUILD_CMD) --build-arg NFD_VERSION=$(VERSION) \
+		--build-arg HOSTMOUNT_PREFIX=$(HOSTMOUNT_PREFIX) \
 		-t $(IMAGE_TAG) \
 		$(IMAGE_BUILD_EXTRA_OPTS) ./
 
@@ -38,6 +40,7 @@ yamls: $(yaml_instances)
 	     -e s',^(\s*)name: node-feature-discovery # NFD namespace,\1name: ${K8S_NAMESPACE},' \
 	     -e s',^(\s*)image:.+$$,\1image: ${IMAGE_TAG},' \
 	     -e s',^(\s*)namespace:.+$$,\1namespace: ${K8S_NAMESPACE},' \
+	     -e s',^(\s*)mountPath: "/host-,\1mountPath: "${HOSTMOUNT_PREFIX},' \
 	     $< > $@
 
 mock: