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/container/docker_logger.go

@@ -0,0 +1,87 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Copyright 2020 The nektos/act Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd))
+
+package container
+
+import (
+	"bufio"
+	"encoding/json"
+	"errors"
+	"io"
+
+	"github.com/sirupsen/logrus"
+)
+
+type dockerMessage struct {
+	ID          string `json:"id"`
+	Stream      string `json:"stream"`
+	Error       string `json:"error"`
+	ErrorDetail struct {
+		Message string
+	}
+	Status   string `json:"status"`
+	Progress string `json:"progress"`
+}
+
+const logPrefix = "  \U0001F433  "
+
+func logDockerResponse(logger logrus.FieldLogger, dockerResponse io.ReadCloser, isError bool) error {
+	if dockerResponse == nil {
+		return nil
+	}
+	defer dockerResponse.Close()
+
+	scanner := bufio.NewScanner(dockerResponse)
+	msg := dockerMessage{}
+
+	for scanner.Scan() {
+		line := scanner.Bytes()
+
+		msg.ID = ""
+		msg.Stream = ""
+		msg.Error = ""
+		msg.ErrorDetail.Message = ""
+		msg.Status = ""
+		msg.Progress = ""
+
+		if err := json.Unmarshal(line, &msg); err != nil {
+			writeLog(logger, false, "Unable to unmarshal line [%s] ==> %v", string(line), err)
+			continue
+		}
+
+		if msg.Error != "" {
+			writeLog(logger, isError, "%s", msg.Error)
+			return errors.New(msg.Error)
+		}
+
+		if msg.ErrorDetail.Message != "" {
+			writeLog(logger, isError, "%s", msg.ErrorDetail.Message)
+			return errors.New(msg.Error)
+		}
+
+		if msg.Status != "" {
+			if msg.Progress != "" {
+				writeLog(logger, isError, "%s :: %s :: %s\n", msg.Status, msg.ID, msg.Progress)
+			} else {
+				writeLog(logger, isError, "%s :: %s\n", msg.Status, msg.ID)
+			}
+		} else if msg.Stream != "" {
+			writeLog(logger, isError, "%s", msg.Stream)
+		} else {
+			writeLog(logger, false, "Unable to handle line: %s", string(line))
+		}
+	}
+
+	return nil
+}
+
+func writeLog(logger logrus.FieldLogger, isError bool, format string, args ...any) {
+	if isError {
+		logger.Errorf(format, args...)
+	} else {
+		logger.Debugf(format, args...)
+	}
+}