Adjust Makefile and regenerate protobuf

Makefile

@@ -163,11 +163,24 @@ go-coverage:
         echo -n "% coverage $$mod: "; $(MAKE) --no-print-directory -C $$mod go-coverage; \
     done
 
+# bingo creates symlinks from the -l option in GOBIN, from where
+# we can easily use it with buf. To have the symlinks inside this
+# repo and on a known location, we set GOBIN to .bingo in the root
+# of the repository (therefore we need to cd ..)
+.PHONY: protoc-deps
+protoc-deps: $(BINGO)
+	@GOPATH="" GOBIN=".bingo" $(BINGO) get -l google.golang.org/protobuf/cmd/protoc-gen-go
+	@GOPATH="" GOBIN=".bingo" $(BINGO) get -l github.com/asim/go-micro/cmd/protoc-gen-micro/v4
+	@GOPATH="" GOBIN=".bingo" $(BINGO) get -l github.com/owncloud/protoc-gen-microweb
+	@GOPATH="" GOBIN=".bingo" $(BINGO) get -l github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-openapiv2
+	@GOPATH="" GOBIN=".bingo" $(BINGO) get -l github.com/pseudomuto/protoc-gen-doc/cmd/protoc-gen-doc
+
+.PHONY: buf-generate
+buf-generate: $(BUF) protoc-deps
+	cd protogen/proto && $(BUF) generate
+
 .PHONY: protobuf
-protobuf:
-	@for mod in $(OCIS_MODULES); do \
-        echo -n "% protobuf $$mod: "; $(MAKE) --no-print-directory -C $$mod protobuf; \
-    done
+protobuf: buf-generate
 
 .PHONY: bingo-update
 bingo-update: $(BINGO)

protogen/gen/ocis/services/accounts/v1/accounts.swagger.json

@@ -389,7 +389,8 @@
             "description": "The id of the group to add a member to",
             "in": "path",
             "required": true,
-            "type": "string"
+            "type": "string",
+            "pattern": "[^/]+"
           },
           {
             "name": "body",
@@ -435,7 +436,8 @@
             "description": "The id of the group to remove a member from",
             "in": "path",
             "required": true,
-            "type": "string"
+            "type": "string",
+            "pattern": "[^/]+"
           },
           {
             "name": "accountId",
@@ -482,7 +484,8 @@
             "description": "The id of the group to list members from",
             "in": "path",
             "required": true,
-            "type": "string"
+            "type": "string",
+            "pattern": "[^/]+"
           },
           {
             "name": "body",