Adding makefile tag target

Makefile

@@ -12,6 +12,9 @@ OS	 		 	:= $(shell uname -s | tr '[:upper:]' '[:lower:]')
 MAKEFILE_PATH 			:= $(abspath $(lastword $(MAKEFILE_LIST)))
 CURRENT_DIR 			:= $(notdir $(patsubst %/,%,$(dir $(MAKEFILE_PATH))))
 PUMAD_HOME			:= $(shell dirname $(MAKEFILE_PATH))
+VERSION 			:= $(shell bundle exec ruby -I lib -r puma-daemon.rb -e 'puts Puma::Daemon::VERSION')
+TAG 				:= $(shell echo "v$(VERSION)")
+BRANCH          		:= $(shell git branch --show)
 
 help:	   			## Prints help message auto-generated from the comments.
 				@grep -E '^[a-zA-Z0-9_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'
@@ -57,3 +60,7 @@ generate-pdf:			## Regenerates README,pdf from README.adoc
 clean:				## Clean-up
 				@rm -rf Gemfile Gemfile.lock coverage
 
+tag:        			## Tag with the latest .version
+				@/usr/bin/env bash -c "git tag | grep -q '$(TAG)' && { echo 'Tag $(TAG) is already assigned.'; exit 1; } || true"
+				@/usr/bin/env bash -c "if [[ $(BRANCH) != master ]]; then echo 'Must be on the main branch'; else git tag -f '$(TAG)'; git push --tags --force; fi"
+

README.adoc

@@ -28,7 +28,7 @@
 |image:https://codecov.io/gh/kigster/puma-daemon/branch/master/graph/badge.svg?token=asxarMSGbz[link=https://codecov.io/gh/kigster/puma-daemon,height="30"]
 
 |Coverage Areas
-|image:https://codecov.io/gh/kigster/puma-daemon/branch/master/graphs/sunburst.svg?token=asxarMSGbz[sunbirst,width="30%",link=https://codecov.io/gh/kigster/puma-daemon,float=left] image:https://codecov.io/gh/kigster/puma-daemon/branch/master/graphs/icicle.svg?token=asxarMSGbz[coverage-graph,,height="30",link=https://codecov.io/gh/kigster/puma-daemon,float=right]
+|image:https://codecov.io/gh/kigster/puma-daemon/branch/master/graphs/icicle.svg?token=asxarMSGbz[coverage-graph,,height="30",link=https://codecov.io/gh/kigster/puma-daemon,float=left]
 
 |===