GitHub env file support (#426)

* Upgrade to the official golangci-lint action and fix some issues it found

* Update deps

* Remove a shadow warning

* Initialize the splitPattern only once

* Initial attempt at supporting $GITHUB_ENV

Needs some polishing and tests

* Now it's actually working

* Replace golang.org/x/crypto/ssh/terminal with golang.org/x/term

* Disable the issue-228 test again

* The linter is picky

* Discovered that the workflow/envs.txt had to exist in certain cases

* Fix small linter issue

pkg/common/draw.go

@@ -43,7 +43,6 @@ type styleDef struct {
 
 var styleDefs = []styleDef{
 	{"\u2554", "\u2557", "\u255a", "\u255d", "\u2550", "\u2551"},
-	//{"\u250c", "\u2510", "\u2514", "\u2518", "\u2500", "\u2502"},
 	{"\u256d", "\u256e", "\u2570", "\u256f", "\u2500", "\u2502"},
 	{"\u250c", "\u2510", "\u2514", "\u2518", "\u254c", "\u254e"},
 	{" ", " ", " ", " ", " ", " "},