Approvals at Branch Protection (#5350)

* Add branch protection for approvals

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add required approvals

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add missing comments and fmt

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add type = approval and group by reviewer_id to review

* Prevent users from adding negative review limits

* Add migration for approval whitelists

Signed-off-by: Jonas Franz <info@jonasfranz.software>

modules/auth/repo_form.go

@@ -135,13 +135,16 @@ func (f *RepoSettingForm) Validate(ctx *macaron.Context, errs binding.Errors) bi
 
 // ProtectBranchForm form for changing protected branch settings
 type ProtectBranchForm struct {
-	Protected            bool
-	EnableWhitelist      bool
-	WhitelistUsers       string
-	WhitelistTeams       string
-	EnableMergeWhitelist bool
-	MergeWhitelistUsers  string
-	MergeWhitelistTeams  string
+	Protected               bool
+	EnableWhitelist         bool
+	WhitelistUsers          string
+	WhitelistTeams          string
+	EnableMergeWhitelist    bool
+	MergeWhitelistUsers     string
+	MergeWhitelistTeams     string
+	RequiredApprovals       int64
+	ApprovalsWhitelistUsers string
+	ApprovalsWhitelistTeams string
 }
 
 // Validate validates the fields