Replace index with id in actions routes (#36842)

This PR migrates the web Actions run/job routes from index-based
`runIndex` or `jobIndex` to database IDs.

**⚠️ BREAKING ⚠️**: Existing saved links/bookmarks that use the old
index-based URLs will no longer resolve after this change.

Improvements of this change:
- Previously, `jobIndex` depended on list order, making it hard to
locate a specific job. Using `jobID` provides stable addressing.
- Web routes now align with API, which already use IDs.
- Behavior is closer to GitHub, which exposes run/job IDs in URLs.
- Provides a cleaner base for future features without relying on list
order.
- #36388 this PR improves the support for reusable workflows. If a job
uses a reusable workflow, it may contain multiple child jobs, which
makes relying on job index to locate a job much more complicated

---------

Signed-off-by: Zettat123 <zettat123@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

models/migrations/v1_26/v326_test.go

@@ -0,0 +1,104 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package v1_26
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/migrations/base"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/test"
+
+	_ "code.gitea.io/gitea/models/actions"
+	_ "code.gitea.io/gitea/models/git"
+	_ "code.gitea.io/gitea/models/repo"
+
+	"github.com/stretchr/testify/require"
+	"xorm.io/xorm"
+)
+
+func Test_FixCommitStatusTargetURLToUseRunAndJobID(t *testing.T) {
+	defer test.MockVariableValue(&setting.AppSubURL, "")()
+
+	type Repository struct {
+		ID        int64 `xorm:"pk autoincr"`
+		OwnerName string
+		Name      string
+	}
+
+	type ActionRun struct {
+		ID     int64 `xorm:"pk autoincr"`
+		RepoID int64 `xorm:"index"`
+		Index  int64
+	}
+
+	type ActionRunJob struct {
+		ID    int64 `xorm:"pk autoincr"`
+		RunID int64 `xorm:"index"`
+	}
+
+	type CommitStatus struct {
+		ID        int64 `xorm:"pk autoincr"`
+		RepoID    int64 `xorm:"index"`
+		TargetURL string
+	}
+
+	type CommitStatusSummary struct {
+		ID        int64  `xorm:"pk autoincr"`
+		RepoID    int64  `xorm:"index"`
+		SHA       string `xorm:"VARCHAR(64) NOT NULL"`
+		State     string `xorm:"VARCHAR(7) NOT NULL"`
+		TargetURL string
+	}
+
+	x, deferable := base.PrepareTestEnv(t, 0,
+		new(Repository),
+		new(ActionRun),
+		new(ActionRunJob),
+		new(CommitStatus),
+		new(CommitStatusSummary),
+	)
+	defer deferable()
+
+	newURL1 := "/testuser/repo1/actions/runs/106/jobs/530"
+	newURL2 := "/testuser/repo1/actions/runs/106/jobs/531"
+
+	invalidWrongRepo := "/otheruser/badrepo/actions/runs/7/jobs/0"
+	invalidNonexistentRun := "/testuser/repo1/actions/runs/10/jobs/0"
+	invalidNonexistentJob := "/testuser/repo1/actions/runs/7/jobs/3"
+	externalTargetURL := "https://ci.example.com/build/123"
+
+	require.NoError(t, FixCommitStatusTargetURLToUseRunAndJobID(x))
+
+	cases := []struct {
+		table string
+		id    int64
+		want  string
+	}{
+		{table: "commit_status", id: 10, want: newURL1},
+		{table: "commit_status", id: 11, want: newURL2},
+		{table: "commit_status", id: 12, want: invalidWrongRepo},
+		{table: "commit_status", id: 13, want: invalidNonexistentRun},
+		{table: "commit_status", id: 14, want: invalidNonexistentJob},
+		{table: "commit_status", id: 15, want: externalTargetURL},
+		{table: "commit_status_summary", id: 20, want: newURL1},
+		{table: "commit_status_summary", id: 21, want: externalTargetURL},
+	}
+
+	for _, tc := range cases {
+		assertTargetURL(t, x, tc.table, tc.id, tc.want)
+	}
+}
+
+func assertTargetURL(t *testing.T, x *xorm.Engine, table string, id int64, want string) {
+	t.Helper()
+
+	var row struct {
+		TargetURL string
+	}
+	has, err := x.Table(table).Where("id=?", id).Cols("target_url").Get(&row)
+	require.NoError(t, err)
+	require.Truef(t, has, "row not found: table=%s id=%d", table, id)
+	require.Equal(t, want, row.TargetURL)
+}