chore: clean up nolint directives in act package (#864)

Removes 88 `nolint` directives (386 → 298) via mechanical, zero-regression cleanups:

- **38 `bodyclose`** in `act/artifactcache/handler_test.go`: replaced by `defer resp.Body.Close()` after each HTTP call.
- **21 dead directives** (`gocyclo`, `dogsled`, `contextcheck`): none of these linters are enabled in `.golangci.yml`, so the directives were doing nothing.
- **29 `testifylint`** directives whose underlying issues were addressed by mechanical rewrites:
  - `assert.Nil(t, err)` → `assert.NoError(t, err)`
  - `assert.NotNil(t, err)` → `assert.Error(t, err)`
  - `assert.Equal(t, true/false, x)` → `assert.True/False(t, x)`
  - `assert.Equal(t, 0, len(x))` → `assert.Empty(t, x)`
  - `assert.Equal(t, N, len(x))` → `assert.Len(t, x, N)`
  - `assert.Len(t, x, 0)` → `assert.Empty(t, x)`

Many `testifylint` directives still apply because they flag `require-error` (i.e. testifylint wants `require.NoError` instead of `assert.NoError` for early bail-out). That's a behavior change (fail-fast vs continue) and out of scope for this purely mechanical cleanup — those can be addressed in a follow-up. Same for `expected-actual`, `equal-values`, `error-is-as`, and the remaining `nilnil` / `unparam` / `forbidigo` / `staticcheck` / `goheader` / `dupl` directives.

`golangci-lint run` is clean. Tests pass for all touched packages.

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

Reviewed-on: https://gitea.com/gitea/act_runner/pulls/864
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: silverwind <2021+silverwind@noreply.gitea.com>
Co-committed-by: silverwind <2021+silverwind@noreply.gitea.com>

act/model/planner.go

@@ -61,8 +61,6 @@ type WorkflowFiles struct {
 }
 
 // NewWorkflowPlanner will load a specific workflow, all workflows from a directory or all workflows from a directory and its subdirectories
-//
-//nolint:gocyclo // function handles many cases
 func NewWorkflowPlanner(path string, noWorkflowRecurse bool) (WorkflowPlanner, error) {
 	path, err := filepath.Abs(path)
 	if err != nil {

act/model/planner_test.go

@@ -57,11 +57,11 @@ func TestWorkflow(t *testing.T) {
 
 	// Check that an invalid job id returns error
 	result, err := createStages(&workflow, "invalid_job_id")
-	assert.NotNil(t, err) //nolint:testifylint // pre-existing issue from nektos/act
+	assert.Error(t, err) //nolint:testifylint // pre-existing issue from nektos/act
 	assert.Nil(t, result)
 
 	// Check that an valid job id returns non-error
 	result, err = createStages(&workflow, "valid_job")
-	assert.Nil(t, err) //nolint:testifylint // pre-existing issue from nektos/act
+	assert.NoError(t, err) //nolint:testifylint // pre-existing issue from nektos/act
 	assert.NotNil(t, result)
 }

act/model/workflow.go

@@ -440,8 +440,6 @@ func (j *Job) Matrix() map[string][]any {
 
 // GetMatrixes returns the matrix cross product
 // It skips includes and hard fails excludes for non-existing keys
-//
-//nolint:gocyclo // function handles many cases
 func (j *Job) GetMatrixes() ([]map[string]any, error) {
 	matrixes := make([]map[string]any, 0)
 	if j.Strategy != nil {

act/model/workflow_test.go

@@ -56,7 +56,7 @@ jobs:
 	assert.NoError(t, err, "read workflow should succeed") //nolint:testifylint // pre-existing issue from nektos/act
 
 	newSchedules = workflow.OnSchedule()
-	assert.Len(t, newSchedules, 0) //nolint:testifylint // pre-existing issue from nektos/act
+	assert.Empty(t, newSchedules)
 
 	yaml = `
 name: local-action-docker-url
@@ -74,7 +74,7 @@ jobs:
 	assert.NoError(t, err, "read workflow should succeed") //nolint:testifylint // pre-existing issue from nektos/act
 
 	newSchedules = workflow.OnSchedule()
-	assert.Len(t, newSchedules, 0) //nolint:testifylint // pre-existing issue from nektos/act
+	assert.Empty(t, newSchedules)
 
 	yaml = `
 name: local-action-docker-url
@@ -91,7 +91,7 @@ jobs:
 	assert.NoError(t, err, "read workflow should succeed") //nolint:testifylint // pre-existing issue from nektos/act
 
 	newSchedules = workflow.OnSchedule()
-	assert.Len(t, newSchedules, 0) //nolint:testifylint // pre-existing issue from nektos/act
+	assert.Empty(t, newSchedules)
 }
 
 func TestReadWorkflow_StringEvent(t *testing.T) {
@@ -870,7 +870,7 @@ jobs:
 					assert.Nil(t, matrix, "matrix should be nil for jobs without strategy")
 				} else {
 					assert.NotNil(t, matrix, "matrix should not be nil")
-					assert.Equal(t, tt.wantLen, len(matrix), "matrix should have expected number of keys") //nolint:testifylint // pre-existing issue from nektos/act
+					assert.Len(t, matrix, tt.wantLen, "matrix should have expected number of keys")
 					if tt.checkFn != nil {
 						tt.checkFn(t, matrix)
 					}