Add Golangci Lint (#676)

Increase golangci timeout

Fix installing golangci-lint in ci

Remove mage targets replaced by golangci

Run golint in ci

Add goheader linter

Enable & fix more linters

Fix lint issues

Add mage target to automagically fix issues found by golangci

golangci-lint run --fix

Add golangci config

Add golangci mage target

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/api/pulls/676
Co-Authored-By: konrad <konrad@kola-entertainments.de>
Co-Committed-By: konrad <konrad@kola-entertainments.de>

pkg/cmd/cmd.go

@@ -18,8 +18,9 @@ package cmd
 
 import (
 	"fmt"
-	"github.com/spf13/cobra"
 	"os"
+
+	"github.com/spf13/cobra"
 )
 
 var rootCmd = &cobra.Command{