Update Makefile and targets

- add `help.mk` to show information about all targets
- update Makefile

Signed-off-by: Evgeniy Kulikov <kim@nspcc.ru>

Makefile

@@ -1,3 +1,6 @@
+-include .env
+-include help.mk
+
 VERSION ?= "$(shell git describe --tags 2>/dev/null | sed 's/^v//')"
 
 GRPC_VERSION=$(shell go list -m google.golang.org/grpc | cut -d " " -f 2)
@@ -8,6 +11,8 @@ B=\033[0;1m
 G=\033[0;92m
 R=\033[0m
 
+.PHONY: version deps image publish
+
 # Show current version
 version:
 	@echo "Current version: $(VERSION)-$(GRPC_VERSION)"
@@ -21,6 +26,7 @@ deps:
 	@printf "${B}${G}⇒ Store vendor localy${R}: "
 	@go mod vendor && echo OK || (echo fail && exit 2)
 
+# Build docker image
 image: VERSION?=
 image: deps
 	@echo "${B}${G}⇒ Build GW docker-image with $(GRPC_VERSION) ${R}"
@@ -29,9 +35,14 @@ image: deps
 		 -f Dockerfile \
 		 -t $(HUB_IMAGE)-http-gate:$(VERSION) .
 
+# Publish docker image
+publish:
+	@echo "${B}${G}⇒ publish docker image ${R}"
+	@docker push $(HUB_IMAGE)-http-gate:$(VERSION)
+
 .PHONY: dev
 
-# v1.24.0 v1.25.1 v1.26.0 v1.27.1
+# Build development docker images
 dev: VERSIONS?=$(GRPC_VERSION)
 dev:
 	@echo "=> Build multiple images for $(VERSIONS)"; \

help.mk

@@ -0,0 +1,11 @@
+.PHONY: help
+
+# Show this help prompt
+help:
+	@echo '  Usage:'
+	@echo ''
+	@echo '    make <target>'
+	@echo ''
+	@echo '  Targets:'
+	@echo ''
+	@awk '/^#/{ comment = substr($$0,3) } comment && /^[a-zA-Z][a-zA-Z0-9_-]+ ?:/{ print "   ", $$1, comment }' $(MAKEFILE_LIST) | column -t -s ':' | grep -v 'IGNORE' | sort | uniq