fix: keep dry runs off the docker daemon and speed up the tests (#1349)

Without a docker daemon six `act/runner` tests failed instead of passing. A dry run still created and removed job networks, the job teardown dropped the dry-run flag along with every other context value, and the container mocks asked the daemon for the runner arch.

This also speeds up the tests and CI without dropping assertions. Most of the time went to git and docker round trips, which are now pinned, batched or coalesced, and the dind and e2e steps cache or overlap more of their setup. On CI, `act/runner` went from 77s to 55s and `test-dind` from 108s to 55s. Locally, `act/runner` without docker went from 53s to 7s.

Split out of https://gitea.com/gitea/runner/pulls/1348, which adds Windows CI on top. The go cache changes moved to https://gitea.com/gitea/runner/pulls/1350.

Written by Claude Code.

---------

Co-authored-by: bircni <[email protected]>
Reviewed-on: https://gitea.com/gitea/runner/pulls/1349
Reviewed-by: bircni <[email protected]>
Co-authored-by: silverwind <[email protected]>

act/common/git/git.go

@@ -10,6 +10,7 @@ import (
 	"encoding/base64"
 	"errors"
 	"fmt"
+	"io"
 	"net/http"
 	"net/url"
 	"os"
@@ -320,9 +321,18 @@ func cachedRef(ref string) string {
 
 func resolveRef(ctx context.Context, dir, ref string) (string, error) {
 	if !isFullObjectID(ref) {
-		for _, name := range []string{cachedRef(ref), "refs/tags/" + ref, "refs/remotes/origin/" + ref} {
-			if sha, err := gitOutput(ctx, dir, "rev-parse", "--verify", name+"^{commit}"); err == nil {
-				return sha, nil
+		revisions := []string{cachedRef(ref) + "^{commit}", "refs/tags/" + ref + "^{commit}", "refs/remotes/origin/" + ref + "^{commit}"}
+		if strings.ContainsAny(ref, "\x00\n") {
+			for _, revision := range revisions {
+				if sha, err := gitOutput(ctx, dir, "rev-parse", "--verify", revision); err == nil {
+					return sha, nil
+				}
+			}
+		} else if output, err := runGitWithStdin(ctx, dir, nil, strings.NewReader(strings.Join(revisions, "\n")+"\n"), "cat-file", "--batch-check=%(objectname)"); err == nil {
+			for sha := range strings.SplitSeq(string(output), "\n") {
+				if isFullObjectID(sha) {
+					return sha, nil
+				}
 			}
 		}
 	}
@@ -427,6 +437,10 @@ func ListFiles(ctx context.Context, dir string) ([]string, error) {
 }
 
 func runGit(ctx context.Context, dir string, input *NewGitCloneExecutorInput, args ...string) ([]byte, error) {
+	return runGitWithStdin(ctx, dir, input, nil, args...)
+}
+
+func runGitWithStdin(ctx context.Context, dir string, input *NewGitCloneExecutorInput, stdin io.Reader, args ...string) ([]byte, error) {
 	config := []string{"core.autocrlf=false", "core.eol=lf"} // keep action files LF
 	if input != nil {
 		config = append(config, RemoteConfig(input.Token, input.InsecureSkipTLS)...)
@@ -438,6 +452,7 @@ func runGit(ctx context.Context, dir string, input *NewGitCloneExecutorInput, ar
 		args = append([]string{"-C", dir}, args...)
 	}
 	cmd := exec.CommandContext(ctx, "git", args...)
+	cmd.Stdin = stdin
 	cmd.Env = slices.DeleteFunc(os.Environ(), func(entry string) bool {
 		name, _, _ := strings.Cut(entry, "=")
 		return slices.Contains(LocalEnvVars, name)