feat(oauth): create struct for generic oauth and add config values

conf/defaults.ini

@@ -59,7 +59,7 @@ cert_key =
 
 #################################### Database ####################################
 [database]
-# You can configure the database connection by specifying type, host, name, user and password 
+# You can configure the database connection by specifying type, host, name, user and password
 # as seperate properties or as on string using the url propertie.
 
 # Either "mysql", "postgres" or "sqlite3", it's your choice
@@ -223,6 +223,19 @@ token_url = https://accounts.google.com/o/oauth2/token
 api_url = https://www.googleapis.com/oauth2/v1/userinfo
 allowed_domains =
 
+#################################### Generic OAuth ##########################
+[auth.generic_oauth]
+enabled = false
+allow_sign_up = false
+client_id = some_id
+client_secret = some_secret
+scopes = user:email
+auth_url =
+token_url =
+api_url =
+team_ids =
+allowed_organizations =
+
 #################################### Basic Auth ##########################
 [auth.basic]
 enabled = true

conf/sample.ini

@@ -61,7 +61,7 @@
 
 #################################### Database ####################################
 [database]
-# You can configure the database connection by specifying type, host, name, user and password 
+# You can configure the database connection by specifying type, host, name, user and password
 # as seperate properties or as on string using the url propertie.
 
 # Either "mysql", "postgres" or "sqlite3", it's your choice
@@ -205,6 +205,19 @@ check_for_updates = true
 ;api_url = https://www.googleapis.com/oauth2/v1/userinfo
 ;allowed_domains =
 
+#################################### Generic OAuth ##########################
+[auth.generic_oauth]
+;enabled = false
+;allow_sign_up = false
+;client_id = some_id
+;client_secret = some_secret
+;scopes = user:email,read:org
+;auth_url = https://foo.bar/login/oauth/authorize
+;token_url = https://foo.bar/login/oauth/access_token
+;api_url = https://foo.bar/user
+;team_ids =
+;allowed_organizations =
+
 #################################### Auth Proxy ##########################
 [auth.proxy]
 ;enabled = false