Try to run linter and unit test from top-level directory

Instead of starting a separate pipeline for each service we now just run
the linter and unit tests from the top-level directory. This allows us
to run the linter it with '--modules-download-mode vendor' and should also
reduce the resource usage.

Makefile

@@ -193,9 +193,7 @@ go-mod-tidy:
 
 .PHONY: test
 test:
-	@for mod in $(OCIS_MODULES); do \
-        $(MAKE) --no-print-directory -C $$mod test || exit 1; \
-    done
+	@go test -v -tags '$(TAGS)' -coverprofile coverage.out ./...
 
 .PHONY: go-coverage
 go-coverage:
@@ -216,6 +214,10 @@ golangci-lint:
         $(MAKE) --no-print-directory -C $$mod golangci-lint; \
     done
 
+.PHONY: ci-golangci-lint
+ci-golangci-lint: $(GOLANGCI_LINT)
+	$(GOLANGCI_LINT) run --modules-download-mode vendor --timeout 15m0s --issues-exit-code 0 --out-format checkstyle > checkstyle.xml
+
 .PHONY: golangci-lint-fix
 golangci-lint-fix:
 	@for mod in $(OCIS_MODULES); do \