Add some help and install

Makefile

@@ -1,10 +1,43 @@
 VERSION=0.1.1
+CTN:=$(shell which podman 2>&1 1>/dev/null && echo "podman" || echo "docker")
+PREFIX=~/.local/
+
+.ONESHELL:
+help:
+	@cat <<EOF
+	=== HELP ===
+	To avoid you to install Go, the build is made by podman or docker.
+	
+	You can use:
+	$$ make install
+	This will build and install katenary inside the PREFIX(/bin) value (default is $(PREFIX))
+	
+	To change the PREFIX to somewhere where only root or sudo users can save the binary, it is recommended to build before install:
+	$$ make build
+	$$ sudo make install PREFIX=/usr/local
+	
+	Katenary is statically built (in Go), so there is no library to install. 
+	EOF
+
+
 build: katenary
 
 katenary: *.go generator/*.go compose/*.go helm/*.go
-	podman run --rm -v $(PWD):/go/src/katenary -w /go/src/katenary --userns keep-id -it golang go build -o katenary  -ldflags="-X 'main.AppVersion=$(VERSION)'" . 
+	@echo Build using $(CTN)
+ifeq ($(CTN),podman)
+	@podman run --rm -v $(PWD):/go/src/katenary -w /go/src/katenary --userns keep-id -it golang go build -o katenary  -ldflags="-X 'main.AppVersion=$(VERSION)'" . 
+else
+	@docker run --rm -v $(PWD):/go/src/katenary:z -w /go/src/katenary --user $(shell id -u):$(shell id -g) -e HOME=/tmp -it golang go build -o katenary  -ldflags="-X 'main.AppVersion=$(VERSION)'" . 
+endif
 
 
+install: build
+	cp katenary $(PREFIX)/bin/katenary
+
+uninstall:
+	rm -f $(PREFIX)/bin/katenary
+
 clean:
 	rm -f katenary
 
+