Fix generator script and Makefile for production use

- Fix docker run command: Remove backslashes to prevent 'invalid reference format' errors
- Add automatic build functionality: Prompt user to build image after generation
- Fix Makefile: Support appliance names with numbers (e.g., n8n) by checking SERVICES list
- Simplify build instructions: Always use 'make' command for consistency
- Fix volume ownership: Automatically set ownership to 1000:1000 for non-root containers

These fixes ensure:
1. Generated appliances bootstrap correctly without docker errors
2. Build process works for all appliance names including those with numbers
3. Containers running as non-root users have correct permissions
4. Complete workflow from generation to built image in one command

Author: OpenNebula Community Contributor

apps-code/community-apps/Makefile

@@ -19,8 +19,9 @@ packer-service_Lithops: packer-service_Lithops_Worker
 
 # run packer build for given distro or service
 $(DIR_EXPORT)/%.qcow2:
-	$(eval DISTRO_NAME := $(shell echo $* | sed 's/[0-9].*//'))
-	$(eval DISTRO_VER  := $(shell echo $* | sed 's/^.[^0-9]*\(.*\)/\1/'))
+	$(eval IS_SERVICE := $(filter $*,$(SERVICES)))
+	$(eval DISTRO_NAME := $(if $(IS_SERVICE),$*,$(shell echo $* | sed 's/[0-9].*//')))
+	$(eval DISTRO_VER  := $(if $(IS_SERVICE),,$(shell echo $* | sed 's/^.[^0-9]*\(.*\)/\1/')))
 	packer/build.sh '$(DISTRO_NAME)' '$(DISTRO_VER)' $@
 
 clean: