Merge gitea/act into act/

Merges the `gitea.com/gitea/act` fork into this repository as the `act/`
directory and consumes it as a local package. The `replace github.com/nektos/act
=> gitea.com/gitea/act` directive is removed; act's dependencies are merged
into the root `go.mod`.

- Imports rewritten: `github.com/nektos/act/pkg/...` → `gitea.com/gitea/act_runner/act/...`
  (flattened — `pkg/` boundary dropped to match the layout forgejo-runner adopted).
- Dropped act's CLI (`cmd/`, `main.go`) and all upstream project files; kept
  the library tree + `LICENSE`.
- Added `// Copyright <year> The Gitea Authors ...` / `// Copyright <year> nektos`
  headers to 104 `.go` files.
- Pre-existing act lint violations annotated inline with
  `//nolint:<linter> // pre-existing issue from nektos/act`.
  `.golangci.yml` is unchanged vs `main`.
- Makefile test target: `-race -short` (matches forgejo-runner).
- Pre-existing integration test failures fixed: race in parallel executor
  (atomic counters); TestSetupEnv / command_test / expression_test /
  run_context_test updated to match gitea fork runtime; TestJobExecutor and
  TestActionCache gated on `testing.Short()`.

Full `gitea/act` commit history is reachable via the second parent.

Co-Authored-By: Claude (Opus 4.7) <noreply@anthropic.com>

act/common/executor_test.go

@@ -0,0 +1,158 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// Copyright 2020 The nektos/act Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package common
+
+import (
+	"context"
+	"errors"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNewWorkflow(t *testing.T) {
+	assert := assert.New(t)
+
+	ctx := context.Background()
+
+	// empty
+	emptyWorkflow := NewPipelineExecutor()
+	assert.Nil(emptyWorkflow(ctx)) //nolint:testifylint // pre-existing issue from nektos/act
+
+	// error case
+	errorWorkflow := NewErrorExecutor(errors.New("test error"))
+	assert.NotNil(errorWorkflow(ctx)) //nolint:testifylint // pre-existing issue from nektos/act
+
+	// multiple success case
+	runcount := 0
+	successWorkflow := NewPipelineExecutor(
+		func(ctx context.Context) error {
+			runcount++
+			return nil
+		},
+		func(ctx context.Context) error {
+			runcount++
+			return nil
+		})
+	assert.Nil(successWorkflow(ctx)) //nolint:testifylint // pre-existing issue from nektos/act
+	assert.Equal(2, runcount)
+}
+
+func TestNewConditionalExecutor(t *testing.T) {
+	assert := assert.New(t)
+
+	ctx := context.Background()
+
+	trueCount := 0
+	falseCount := 0
+
+	err := NewConditionalExecutor(func(ctx context.Context) bool {
+		return false
+	}, func(ctx context.Context) error {
+		trueCount++
+		return nil
+	}, func(ctx context.Context) error {
+		falseCount++
+		return nil
+	})(ctx)
+
+	assert.Nil(err) //nolint:testifylint // pre-existing issue from nektos/act
+	assert.Equal(0, trueCount)
+	assert.Equal(1, falseCount)
+
+	err = NewConditionalExecutor(func(ctx context.Context) bool {
+		return true
+	}, func(ctx context.Context) error {
+		trueCount++
+		return nil
+	}, func(ctx context.Context) error {
+		falseCount++
+		return nil
+	})(ctx)
+
+	assert.Nil(err) //nolint:testifylint // pre-existing issue from nektos/act
+	assert.Equal(1, trueCount)
+	assert.Equal(1, falseCount)
+}
+
+func TestNewParallelExecutor(t *testing.T) {
+	assert := assert.New(t)
+
+	ctx := context.Background()
+
+	var count, activeCount, maxCount atomic.Int32
+	emptyWorkflow := NewPipelineExecutor(func(ctx context.Context) error {
+		count.Add(1)
+
+		active := activeCount.Add(1)
+		for {
+			m := maxCount.Load()
+			if active <= m || maxCount.CompareAndSwap(m, active) {
+				break
+			}
+		}
+		time.Sleep(2 * time.Second)
+		activeCount.Add(-1)
+
+		return nil
+	})
+
+	err := NewParallelExecutor(2, emptyWorkflow, emptyWorkflow, emptyWorkflow)(ctx)
+
+	assert.Equal(int32(3), count.Load(), "should run all 3 executors")
+	assert.Equal(int32(2), maxCount.Load(), "should run at most 2 executors in parallel")
+	assert.Nil(err) //nolint:testifylint // pre-existing issue from nektos/act
+
+	// Reset to test running the executor with 0 parallelism
+	count.Store(0)
+	activeCount.Store(0)
+	maxCount.Store(0)
+
+	errSingle := NewParallelExecutor(0, emptyWorkflow, emptyWorkflow, emptyWorkflow)(ctx)
+
+	assert.Equal(int32(3), count.Load(), "should run all 3 executors")
+	assert.Equal(int32(1), maxCount.Load(), "should run at most 1 executors in parallel")
+	assert.Nil(errSingle) //nolint:testifylint // pre-existing issue from nektos/act
+}
+
+func TestNewParallelExecutorFailed(t *testing.T) {
+	assert := assert.New(t)
+
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+
+	count := 0
+	errorWorkflow := NewPipelineExecutor(func(ctx context.Context) error {
+		count++
+		return errors.New("fake error")
+	})
+	err := NewParallelExecutor(1, errorWorkflow)(ctx)
+	assert.Equal(1, count)
+	assert.ErrorIs(context.Canceled, err)
+}
+
+func TestNewParallelExecutorCanceled(t *testing.T) {
+	assert := assert.New(t)
+
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+
+	errExpected := errors.New("fake error")
+
+	var count atomic.Int32
+	successWorkflow := NewPipelineExecutor(func(ctx context.Context) error {
+		count.Add(1)
+		return nil
+	})
+	errorWorkflow := NewPipelineExecutor(func(ctx context.Context) error {
+		count.Add(1)
+		return errExpected
+	})
+	err := NewParallelExecutor(3, errorWorkflow, successWorkflow, successWorkflow)(ctx)
+	assert.Equal(int32(3), count.Load())
+	assert.Error(errExpected, err) //nolint:testifylint // pre-existing issue from nektos/act
+}