refactor: remove unreachable runner code (#1179)

Remove inherited act APIs, configuration branches, and test seams that neither the daemon nor exec can reach. Constant-fold settings both entry points already enforce and consolidate duplicate runner paths.

Major removals:

- Unwired custom action-cache and local-repository-cache implementations.
- Legacy matrix, platform, input, container-reuse, logging, Git remote, and action-replacement configuration paths.
- Unused Docker socket, container network, tar-copy, and platform PTY wrappers.
- Single-implementation filesystem, environment, runner, and expression abstractions.
- Duplicated step-container, command-logging, credential, reusable-workflow, and execution paths.
- Generated client mock boilerplate, obsolete fixtures, test-only seams, stale wrappers, and commented-out code.

This removes 2844 net Go lines while retaining Gitea RPC, event, matrix, input, cache, artifact, action, reusable workflow, Docker, host, exec, and release behavior.

Assisted by Codex (GPT-5).

Reviewed-on: https://gitea.com/gitea/runner/pulls/1179
Reviewed-by: bircni <bircni@icloud.com>
Co-authored-by: silverwind <me@silverwind.io>

act/runner/step_docker.go

@@ -6,7 +6,6 @@ package runner
 
 import (
 	"context"
-	"fmt"
 	"strings"
 
 	"gitea.com/gitea/runner/act/common"
@@ -22,11 +21,7 @@ type stepDocker struct {
 	env        map[string]string
 }
 
-func (sd *stepDocker) pre() common.Executor {
-	return func(ctx context.Context) error {
-		return nil
-	}
-}
+func (sd *stepDocker) pre() common.Executor { return common.NewPipelineExecutor() }
 
 func (sd *stepDocker) main() common.Executor {
 	sd.env = map[string]string{}
@@ -34,11 +29,7 @@ func (sd *stepDocker) main() common.Executor {
 	return runStepExecutor(sd, stepStageMain, sd.runUsesContainer())
 }
 
-func (sd *stepDocker) post() common.Executor {
-	return func(ctx context.Context) error {
-		return nil
-	}
-}
+func (sd *stepDocker) post() common.Executor { return common.NewPipelineExecutor() }
 
 func (sd *stepDocker) getRunContext() *RunContext {
 	return sd.RunContext
@@ -77,64 +68,15 @@ func (sd *stepDocker) runUsesContainer() common.Executor {
 			entrypoint = []string{entry}
 		}
 
-		stepContainer := sd.newStepContainer(ctx, image, cmd, entrypoint)
+		stepContainer := newStepContainer(ctx, sd, image, cmd, entrypoint, "")
 
 		return common.NewPipelineExecutor(
 			stepContainer.Pull(rc.Config.ForcePull),
-			stepContainer.Remove().IfBool(!rc.Config.ReuseContainers),
+			stepContainer.Remove(),
 			stepContainer.Create(rc.Config.ContainerCapAdd, rc.Config.ContainerCapDrop),
 			stepContainer.Start(true),
-		).Finally(
-			stepContainer.Remove().IfBool(!rc.Config.ReuseContainers && !rc.Config.AutoRemove),
 		).Finally(stepContainer.Close())(ctx)
 	}
 }
 
 var ContainerNewContainer = container.NewContainer
-
-func (sd *stepDocker) newStepContainer(ctx context.Context, image string, cmd, entrypoint []string) container.Container {
-	rc := sd.RunContext
-	step := sd.Step
-
-	rawLogger := common.Logger(ctx).WithField("raw_output", true)
-	logWriter := common.NewLineWriter(rc.commandHandler(ctx), func(s string) bool {
-		if rc.Config.LogOutput {
-			rawLogger.Infof("%s", s)
-		} else {
-			rawLogger.Debugf("%s", s)
-		}
-		return true
-	})
-	envList := make([]string, 0)
-	for k, v := range sd.env {
-		envList = append(envList, fmt.Sprintf("%s=%s", k, v))
-	}
-
-	envList = append(envList, rc.runnerEnv(ctx)...)
-
-	binds, mounts := rc.GetBindsAndMounts()
-	networkMode := "container:" + rc.jobContainerName()
-	if rc.IsHostEnv(ctx) {
-		networkMode = "default"
-	}
-	stepContainer := ContainerNewContainer(&container.NewContainerInput{
-		Cmd:          cmd,
-		Entrypoint:   entrypoint,
-		WorkingDir:   rc.JobContainer.ToContainerPath(rc.Config.Workdir),
-		Image:        image,
-		Name:         createContainerName(rc.jobContainerName(), "STEP-"+step.ID),
-		Env:          envList,
-		Mounts:       mounts,
-		NetworkMode:  networkMode,
-		Binds:        binds,
-		Stdout:       logWriter,
-		Stderr:       logWriter,
-		Privileged:   rc.Config.Privileged,
-		UsernsMode:   rc.Config.UsernsMode,
-		Platform:     rc.Config.ContainerArchitecture,
-		AutoRemove:   rc.Config.AutoRemove,
-		ValidVolumes: rc.validVolumes(),
-		AllocatePTY:  rc.Config.AllocatePTY,
-	})
-	return stepContainer
-}