Update images, fix extrapath (#723)

* fix: typo

* fix: remove debug for git references

it generates a massive amount of logs

* feat: read values from env

allows to test act on GHA when it's not a main repo

* fix: merge extrapath with PATH

* fix(tests): add additional shells for testing

* fix(image): update images

pin node to major version only, current node version: 12.22.1
replace most images with `node:12-buster-slim` to prevent
errors on macOS runner due to DockerHub pull limit
replace ocaml image

Co-authored-by: Casey Lee <cplee@nektos.com>

pkg/common/git.go

@@ -86,7 +86,7 @@ func FindGitRef(file string) (string, error) {
 				if r == nil || err != nil {
 					break
 				}
-				log.Debugf("Reference: name=%s sha=%s", r.Name().String(), r.Hash().String())
+				// log.Debugf("Reference: name=%s sha=%s", r.Name().String(), r.Hash().String())
 				if r.Hash().String() == ref {
 					if r.Name().IsTag() {
 						refTag = r.Name().String()