test(e2e): cover the register/daemon CLI and failing jobs (#1346)

The e2e suite started the runner in-process and never exercised failing jobs. This adds a scenario that builds the binary and drives `register` then `daemon` against the Gitea fixture, and one for failed, skipped, continue-on-error and timed-out jobs.

Verified locally against gitea/gitea:main-nightly.

Assisted-by: Codet:codet
Reviewed-on: https://gitea.com/gitea/runner/pulls/1346
Reviewed-by: Zettat123 <[email protected]>

e2e/failure_test.go

@@ -0,0 +1,73 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+//go:build e2e
+
+package e2e
+
+import (
+	"strings"
+	"testing"
+)
+
+func testFailurePaths(t *testing.T) {
+	t.Parallel()
+	ctx := t.Context()
+
+	api, repo := newScenario(t)
+	pushWorkflow(t, api, repo, "failure.yml")
+
+	wfRun := waitForRun(t, api, repo)
+	completed, err := api.WaitForRunConclusion(ctx, repo, wfRun.ID, runTimeout)
+	if err != nil {
+		dumpRunLogs(t, api, repo, wfRun.ID)
+		t.Fatalf("wait for run: %v", err)
+	}
+	if completed.Conclusion != "failure" {
+		t.Errorf("run concluded %q, want failure", completed.Conclusion)
+	}
+
+	jobs, err := api.Jobs(ctx, repo, wfRun.ID)
+	if err != nil {
+		t.Fatalf("list jobs: %v", err)
+	}
+	want := map[string]string{
+		"fail":      "failure",
+		"tolerated": "success",
+		"dependent": "skipped",
+		"timeout":   "failure",
+	}
+	for _, job := range jobs {
+		if w, ok := want[job.Name]; ok && job.Conclusion != w {
+			t.Errorf("job %q concluded %q, want %q", job.Name, job.Conclusion, w)
+		}
+		delete(want, job.Name)
+	}
+	for name := range want {
+		t.Errorf("job %q not found", name)
+	}
+
+	var all strings.Builder
+	for _, job := range jobs {
+		if job.Conclusion == "skipped" { // a skipped job never started, so it has no log
+			continue
+		}
+		jobLogs, err := api.JobLogs(ctx, repo, job.ID)
+		if err != nil {
+			t.Fatalf("job logs for %s: %v", job.Name, err)
+		}
+		all.WriteString(jobLogs)
+	}
+	logs := all.String()
+	for _, marker := range []string{"e2e-before-fail", "e2e-failure-cleanup", "e2e-tolerated-next", "e2e-timeout-started"} {
+		if commandRow(logs, marker) != marker {
+			t.Errorf("logs are missing %q", marker)
+		}
+	}
+	if commandRow(logs, "e2e-skipped-step") != "" {
+		t.Error("a success() step ran after a failed step")
+	}
+	if t.Failed() {
+		t.Logf("full stored logs:\n%s", logs)
+	}
+}