meta: allow use of collections key

f/ansible-meta.json

@@ -1348,6 +1348,14 @@
       "title": "Allow Duplicates",
       "type": "boolean"
     },
+    "collections": {
+      "items": {
+        "markdownDescription": "See [Using collections in roles](https://docs.ansible.com/ansible/latest/user_guide/collections_using.html#using-collections-in-roles) and [collection naming conventions](https://docs.ansible.com/ansible/latest/dev_guide/developing_modules_in_groups.html#naming-conventions)",
+        "pattern": "^[a-z_]+\\.[a-z_]+$",
+        "type": "string"
+      },
+      "type": "array"
+    },
     "dependencies": {
       "items": {
         "$ref": "#/definitions/DependencyModel"

negative_test/roles/meta_invalid_collection/meta/main.yml

@@ -0,0 +1,10 @@
+collections:
+  - foo # invalid pattern
+galaxy_info:
+  description: foo
+  license: bar
+  min_ansible_version: "2.10"
+  platforms:
+    - name: Fedora
+      versions:
+        - all

negative_test/roles/meta_invalid_collections/meta/main.yml

@@ -0,0 +1,10 @@
+collections:
+  - FOO.BAR # invalid pattern, need to use lowercase
+galaxy_info:
+  description: foo
+  license: bar
+  min_ansible_version: "2.10"
+  platforms:
+    - name: Fedora
+      versions:
+        - all

test/roles/foo/meta/main.yml

@@ -1,3 +1,5 @@
+collections:
+  - foo.bar
 dependencies:
   - name: ansible-role-foo
     version: "1.0"