Added some CAS and SAML settings. Not tested. Please test and send pull requests if it does not work.

See https://github.com/wekan/wekan/wiki/SAML and https://github.com/wekan/wekan/wiki/CAS

Thanks to xet7 !

Related #3204,
related #708

docker-compose.yml

@@ -601,7 +601,24 @@ services:
       # Hide password login form
       # - PASSWORD_LOGIN_ENABLED=true
       #-------------------------------------------------------------------
-    depends_on:
+      #- CAS_ENABLED=true
+      #- CAS_BASE_URL=https://cas.example.com/cas
+      #- CAS_LOGIN_URL=https://cas.example.com/login
+      #- CAS_VALIDATE_URL=https://cas.example.com/cas/p3/serviceValidate
+      #---------------------------------------------------------------------
+      #- SAML_ENABLED=true
+      #- SAML_PROVIDER=
+      #- SAML_ENTRYPOINT=
+      #- SAML_ISSUER=
+      #- SAML_CERT=
+      #- SAML_IDPSLO_REDIRECTURL=
+      #- SAML_PRIVATE_KEYFILE=
+      #- SAML_PUBLIC_CERTFILE=
+      #- SAML_IDENTIFIER_FORMAT=
+      #- SAML_LOCAL_PROFILE_MATCH_ATTRIBUTE=
+      #- SAML_ATTRIBUTES=
+      #---------------------------------------------------------------------
+        depends_on:
       - wekandb
 
 #---------------------------------------------------------------------------------