Add make lint job to locally lint changes before pushing to remote

Author: SimonBarendse

.github/workflows/test.yaml

@@ -43,4 +43,5 @@ jobs:
         uses: golangci/golangci-lint-action@v3
         with:
           # version of golangci-lint to use
+          # Version should stay in sync with version used for local linting (lint job in Makefile).
           version: v1.50.1

Makefile

@@ -42,6 +42,10 @@ $(plugins_dir):
 test:
 	go test ./...
 
+lint:
+	# Version used should stay in sync with version in CI (.github/workflows/test.yaml).
+	docker run --rm -v $(pwd):/app -w /app golangci/golangci-lint:v1.50.1 golangci-lint run
+
 %/remove-local: beta-notice
 	$(eval plugin := $(firstword $(subst /, ,$@)))
 	rm -f ~/.op/plugins/local/$(plugin)