feat(infra/git): clone/fetch/push/commit/status verbs + integration tests

internal/infra/git/clone.go

@@ -0,0 +1,20 @@
+package git
+
+import (
+	"context"
+	"fmt"
+)
+
+// Clone 把 remoteURL 上的 branch 浅克隆到 dst。dst 不能预先存在。
+func (r *DefaultRunner) Clone(ctx context.Context, dst, remoteURL, branch string, cred *Credential) error {
+	ctx, cancel := withCtx(ctx, r.cfg.CloneTimeout)
+	defer cancel()
+	env, cleanup, err := credentialEnv(r.cfg.TmpDir, cred)
+	if err != nil {
+		return fmt.Errorf("credential env: %w", err)
+	}
+	defer cleanup()
+	args := []string{"clone", "--branch", branch, "--single-branch", remoteURL, dst}
+	_, _, err = r.exec(ctx, "", env, args...)
+	return err
+}