feat: allow using "next" version on supported version (#58)

This also allows using the action in https://github.com/mage-os/generate-mirror-repo-js where the test module is an external package installed with composer. In this case, no local path repo configuration is needed.

Co-authored-by: Vinai Kopp <Vinai@users.noreply.github.com>

supported-version/src/kind/compute-kind.ts

@@ -5,6 +5,7 @@ export const KNOWN_KINDS = {
     'currently-supported': true,
     'latest': true,
     'custom': true,
+    'nightly': true,
     'all': true,
 }
 

supported-version/src/kind/nightly.json

@@ -0,0 +1,3 @@
+[
+    "magento/project-community-edition:next"
+]