Add version info to minikube-iso

.github/ISSUE_TEMPLATE

@@ -22,7 +22,7 @@ explain why.
 **Environment**:
 - **OS** (e.g. from /etc/os-release):
 - **VM Driver** (e.g. `cat ~/.minikube/machines/minikube/config.json | grep DriverName`):
-- **ISO version** (e.g. `cat ~/.minikube/machines/minikube/config.json | grep ISO`):
+- **ISO version** (e.g. `cat ~/.minikube/machines/minikube/config.json | grep ISO` or `minikube ssh cat /etc/VERSION`):
 - **Install tools**:
 - **Others**:
 

.gitignore

@@ -28,6 +28,9 @@ _testmain.go
 /out
 /_gopath
 
+#iso version file
+deploy/iso/minikube-iso/board/coreos/minikube/rootfs-overlay/etc/VERSION
+
 /pkg/minikube/assets/assets.go
 /minikube
 

Makefile

@@ -84,6 +84,7 @@ localkube-image: out/localkube
 	make -C deploy/docker VERSION=$(VERSION)
 
 minikube_iso:
+	echo $(ISO_VERSION) > deploy/iso/minikube-iso/board/coreos/minikube/rootfs-overlay/etc/VERSION
 	if [ ! -d $(BUILD_DIR)/buildroot ]; then \
 		mkdir -p $(BUILD_DIR); \
 		git clone --branch=$(BUILDROOT_BRANCH) https://github.com/buildroot/buildroot $(BUILD_DIR)/buildroot; \