[mod] Tools to install and maintain golang [1] binaries & packages.

[1] https://golang.org/doc/devel/release#policy

A simple *helloworld* test with user 'my_user' :

  sudo -H adduser my_user
  ./manage go.golang go1.17.3 my_user
  ./manage go.install github.com/go-training/helloworld@latest my_user
  ./manage go.bash my_user
  $ helloword
  Hello World!!

Don't forget to remove 'my_user':  sudo -H deluser --remove-home my_user

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

Makefile

@@ -65,6 +65,7 @@ test.shell:
 		utils/lib.sh \
 		utils/lib_install.sh \
 		utils/lib_static.sh \
+		utils/lib_go.sh \
 	        utils/filtron.sh \
 	        utils/searx.sh \
 	        utils/morty.sh \