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_network.go

@@ -0,0 +1,86 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// Copyright 2023 The nektos/act Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd))
+
+package container
+
+import (
+	"context"
+
+	"gitea.com/gitea/act_runner/act/common"
+
+	"github.com/docker/docker/api/types"
+)
+
+func NewDockerNetworkCreateExecutor(name string) common.Executor {
+	return func(ctx context.Context) error {
+		cli, err := GetDockerClient(ctx)
+		if err != nil {
+			return err
+		}
+		defer cli.Close()
+
+		// Only create the network if it doesn't exist
+		networks, err := cli.NetworkList(ctx, types.NetworkListOptions{})
+		if err != nil {
+			return err
+		}
+		// For Gitea, reduce log noise
+		// common.Logger(ctx).Debugf("%v", networks)
+		for _, network := range networks {
+			if network.Name == name {
+				common.Logger(ctx).Debugf("Network %v exists", name)
+				return nil
+			}
+		}
+
+		_, err = cli.NetworkCreate(ctx, name, types.NetworkCreate{
+			Driver: "bridge",
+			Scope:  "local",
+		})
+		if err != nil {
+			return err
+		}
+
+		return nil
+	}
+}
+
+func NewDockerNetworkRemoveExecutor(name string) common.Executor {
+	return func(ctx context.Context) error {
+		cli, err := GetDockerClient(ctx)
+		if err != nil {
+			return err
+		}
+		defer cli.Close()
+
+		// Make shure that all network of the specified name are removed
+		// cli.NetworkRemove refuses to remove a network if there are duplicates
+		networks, err := cli.NetworkList(ctx, types.NetworkListOptions{})
+		if err != nil {
+			return err
+		}
+		// For Gitea, reduce log noise
+		// common.Logger(ctx).Debugf("%v", networks)
+		for _, network := range networks {
+			if network.Name == name {
+				result, err := cli.NetworkInspect(ctx, network.ID, types.NetworkInspectOptions{})
+				if err != nil {
+					return err
+				}
+
+				if len(result.Containers) == 0 {
+					if err = cli.NetworkRemove(ctx, network.ID); err != nil {
+						common.Logger(ctx).Debugf("%v", err)
+					}
+				} else {
+					common.Logger(ctx).Debugf("Refusing to remove network %v because it still has active endpoints", name)
+				}
+			}
+		}
+
+		return err
+	}
+}