Use ignore directive to ignore test files not to be formatted

We have adopted the workaround passing a result of `git ls-files '*.go'
':!vendor'` to gofumpt in jesseduffield#4809. Currently, gofumpt suports `ignore`
directive. So we can use it without any workarounds.

Author: kyu08

Makefile

@@ -34,11 +34,9 @@ test: unit-test integration-test-all
 generate:
 	go generate ./...
 
-# If you execute `gofumpt -l -w .`, it will format all Go files in the current directory, including `test/_results/*` files.
-# We pass only Git-tracked Go files to gofumpt because we don't want to format the test results or get errors from it.
 .PHONY: format
 format:
-	git ls-files '*.go' ':!vendor' | xargs gofumpt -l -w
+	go run mvdan.cc/gofumpt@v0.9.1 -l -w .
 
 .PHONY: lint
 lint:

go.mod

@@ -2,6 +2,9 @@ module github.com/jesseduffield/lazygit
 
 go 1.25.0
 
+// This is necessary to ignore test files when executing gofumpt.
+ignore ./test
+
 require (
 	dario.cat/mergo v1.0.1
 	github.com/adrg/xdg v0.4.0