Update governance roles and privileges (nasa#4718)

* Update governance roles and privileges

Added 'Release' privilege to roles and introduced 'Maintainer' role with specific responsibilities.

* sp

* Modify Maintainer permissions in GOVERNANCE.md

Updated Maintainer permissions in governance table to remove the decision capacity.

Author: LeStarch

GOVERNANCE.md

@@ -26,12 +26,13 @@ The F Prime community breaks down into a set of roles that take actions and have
 
 Each role has a set of privileges afforded to it. These privileges are: 
 
-| Role              | Read/Clone | Propose Pull Request | Comment in Tickets / Discussions | Review | Binding Review | Merge | Project Decisions |
-|-------------------|------------|----------------------|----------------------------------|--------|----------------|-------|-------------------|
-| User              | ✅          | ❌                    | ❌                                | ❌      | ❌              | ❌     | ❌                 |
-| Contributor       | ✅          | ✅                    | ✅                                | ✅      | ❌              | ❌     | ❌                 |
-| CCB Member        | ✅          | ✅                    | ✅                                | ✅      | ✅              | ❌     | ✅                 |
-| Community Manager | ✅          | ✅                    | ✅                                | ✅      | ✅              | ✅     | ✅                  |
+| Role              | Read/Clone | Propose Pull Request | Comment in Tickets / Discussions | Review | Binding Review | Merge | Project Decisions | Release |
+|-------------------|------------|----------------------|----------------------------------|--------|----------------|-------|-------------------|---------|
+| User              | ✅          | ❌                   | ❌                               | ❌     | ❌             | ❌     | ❌                | ❌       |
+| Contributor       | ✅          | ✅                   | ✅                               | ✅     | ❌             | ❌     | ❌                | ❌       |
+| CCB Member        | ✅          | ✅                   | ✅                               | ✅     | ❌             | ❌     | ✅                | ❌       |
+| Maintainer        | ✅          | ✅                   | ✅                               | ✅     | ✅             | ✅     | ❌                | ✅       |
+| Community Manager | ✅          | ✅                   | ✅                               | ✅     | ✅             | ✅     | ✅                | ✅       |
 
 ### User
 
@@ -51,6 +52,10 @@ CCB members do not operate in a vacuum. These members solicit feedback from the
 
 The CCB is also charged with selecting the contributors to join the CCB.  These members must be active sustained members of the F Prime community.
 
+### Maintainer
+
+Maintainers are granted the authority to merge and release specific products as part of the Project. These maintainers may or may not be part of the CCB but they do assist the Community Managers in their charge of carrying out the decisions of the CCB as directed to a specific product.  Maintainers are selected by the CCB.
+
 ### Community Manager 
 
 A community manager is charged with carrying out the decisions of the CCB. This often means communicating back decisions, merging pull requests, and guiding Calls for Comments. The CCB is charged with selecting community managers. Pull requests are merged by Community Managers after receiving a Binding Review from at least one CCB Member.