$GITHUB_PATH support (#566)

* Regression in the .golangci.yml file

* This looks like an even better fix to #451

The previous solution only prevented the `starting container process caused "exec: \"bash\"`
error when someone added an "extra" path in the workflow using `::add-path`

* Add support for >> $GITHUB_PATH

* The newRunCommand has too high cyclomatic complexity

* Add "linux/arm64" to new test

* The cyclop linter was complaining so I extracted some funcs

* Close some readers

* Fix typo

* fix: add missing composite function

* Fix regress from merging

* Keep the error messages as is

* consolidate with master

* Close the tar reader on defer

* New way to get ContainerWorkdir

* Remove arch from runner test

* Separate the UpdateFromEnv and UpdateFromPath

Co-authored-by: hackercat <me@hackerc.at>

pkg/runner/runner_test.go

@@ -107,6 +107,7 @@ func TestRunEvent(t *testing.T) {
 		{"testdata", "uses-composite", "push", "", platforms, ""},
 		{"testdata", "issue-597", "push", "", platforms, ""},
 		{"testdata", "issue-598", "push", "", platforms, ""},
+		{"testdata", "env-and-path", "push", "", platforms, ""},
 		// {"testdata", "issue-228", "push", "", platforms, ""}, // TODO [igni]: Remove this once everything passes
 
 		// single test for different architecture: linux/arm64