Use golangci-lint fmt to format code (#163)

Use `golangci-lint fmt` to format code, upgrading `.golangci.yml` to v2 and mirroring the linter configuration used by https://github.com/go-gitea/gitea. `gci` now handles import ordering into standard, project-local, blank, and default groups.

Mirrors https://github.com/go-gitea/gitea/pull/37194.

Changes:
- Upgrade `.golangci.yml` to v2 format with the same linter set as gitea (minus `prealloc`, `unparam`, `testifylint`, `nilnil` which produced too many pre-existing issues)
- Add path-based exclusions (`bodyclose`, `gosec` in tests; `gosec:G115`/`G117` globally)
- Run lint via `make lint-go` in CI instead of `golangci/golangci-lint-action`, matching the pattern used by other Gitea repos
- Apply safe auto-fixes (`modernize`, `perfsprint`, `usetesting`, etc.)
- Add explanations to existing `//nolint` directives
- Remove dead code (unused `newRemoteReusableWorkflow` and `networkName`), duplicate imports, and shadowed `max` builtins
- Replace deprecated `docker/distribution/reference` with `distribution/reference`
- Fix `Deprecated:` comment casing and simplify nil/len checks

---
This PR was written with the help of Claude Opus 4.7

Reviewed-on: https://gitea.com/gitea/act/pulls/163
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
Co-committed-by: silverwind <me@silverwind.io>

pkg/exprparser/interpreter_test.go

@@ -5,13 +5,14 @@ import (
 	"testing"
 
 	"github.com/nektos/act/pkg/model"
+
 	"github.com/stretchr/testify/assert"
 )
 
 func TestLiterals(t *testing.T) {
 	table := []struct {
 		input    string
-		expected interface{}
+		expected any
 		name     string
 	}{
 		{"true", true, "true"},
@@ -40,7 +41,7 @@ func TestLiterals(t *testing.T) {
 func TestOperators(t *testing.T) {
 	table := []struct {
 		input    string
-		expected interface{}
+		expected any
 		name     string
 		error    string
 	}{
@@ -68,7 +69,7 @@ func TestOperators(t *testing.T) {
 		{`true && false`, false, "and", ""},
 		{`true || false`, true, "or", ""},
 		{`fromJSON('{}') && true`, true, "and-boolean-object", ""},
-		{`fromJSON('{}') || false`, make(map[string]interface{}), "or-boolean-object", ""},
+		{`fromJSON('{}') || false`, make(map[string]any), "or-boolean-object", ""},
 		{"github.event.commits[0].author.username != github.event.commits[1].author.username", true, "property-comparison1", ""},
 		{"github.event.commits[0].author.username1 != github.event.commits[1].author.username", true, "property-comparison2", ""},
 		{"github.event.commits[0].author.username != github.event.commits[1].author.username1", true, "property-comparison3", ""},
@@ -79,15 +80,15 @@ func TestOperators(t *testing.T) {
 	env := &EvaluationEnvironment{
 		Github: &model.GithubContext{
 			Action: "push",
-			Event: map[string]interface{}{
-				"commits": []interface{}{
-					map[string]interface{}{
-						"author": map[string]interface{}{
+			Event: map[string]any{
+				"commits": []any{
+					map[string]any{
+						"author": map[string]any{
 							"username": "someone",
 						},
 					},
-					map[string]interface{}{
-						"author": map[string]interface{}{
+					map[string]any{
+						"author": map[string]any{
 							"username": "someone-else",
 						},
 					},
@@ -114,7 +115,7 @@ func TestOperators(t *testing.T) {
 func TestOperatorsCompare(t *testing.T) {
 	table := []struct {
 		input    string
-		expected interface{}
+		expected any
 		name     string
 	}{
 		{"!null", true, "not-null"},
@@ -162,7 +163,7 @@ func TestOperatorsCompare(t *testing.T) {
 func TestOperatorsBooleanEvaluation(t *testing.T) {
 	table := []struct {
 		input    string
-		expected interface{}
+		expected any
 		name     string
 	}{
 		// true &&
@@ -529,7 +530,7 @@ func TestOperatorsBooleanEvaluation(t *testing.T) {
 func TestContexts(t *testing.T) {
 	table := []struct {
 		input    string
-		expected interface{}
+		expected any
 		name     string
 	}{
 		{"github.action", "push", "github-context"},
@@ -586,7 +587,7 @@ func TestContexts(t *testing.T) {
 				Conclusion: model.StepStatusSkipped,
 			},
 		},
-		Runner: map[string]interface{}{
+		Runner: map[string]any{
 			"os":         "Linux",
 			"temp":       "/tmp",
 			"tool_cache": "/opt/hostedtoolcache",
@@ -597,10 +598,10 @@ func TestContexts(t *testing.T) {
 		Vars: map[string]string{
 			"name": "value",
 		},
-		Strategy: map[string]interface{}{
+		Strategy: map[string]any{
 			"fail-fast": true,
 		},
-		Matrix: map[string]interface{}{
+		Matrix: map[string]any{
 			"os": "Linux",
 		},
 		Needs: map[string]Needs{
@@ -611,7 +612,7 @@ func TestContexts(t *testing.T) {
 				Result: "success",
 			},
 		},
-		Inputs: map[string]interface{}{
+		Inputs: map[string]any{
 			"name": "value",
 		},
 	}