fix!: use run ID instead of run Index in artifacts download web views

- the run ID used to download artifacts is absolute (ID) instead of being
  relative to the repository (Index) for compatibility with the url built
  and returned as `artifact-url` by the the upload-artifact@v4 action.
- this is a breaking change because URLs to download artifacts
  previous saved/bookmarked and not yet expired expired are no
  longer working, they need to be looked up again by visiting the job
  web page.

- add unit tests for getRunByID().
- RepoActionView.test.js verifies the download URL is built using the
  run ID.
- lAdd integration tests to verify the RunID is set as expected in
  the template used by RepoActionView.vue.

Refs https://code.forgejo.org/forgejo/runner/issues/187

tests/integration/html_helper.go

@@ -26,6 +26,17 @@ func NewHTMLParser(t testing.TB, body *bytes.Buffer) *HTMLDoc {
 	return &HTMLDoc{doc: doc}
 }
 
+func (doc *HTMLDoc) AssertAttrEqual(t testing.TB, selector, attr, expected string) bool {
+	t.Helper()
+	selection := doc.doc.Find(selector)
+	require.NotEmpty(t, selection, selector)
+
+	actual, exists := selection.Attr(attr)
+	require.True(t, exists, "%s not found in %s", attr, selection.Text())
+
+	return assert.Equal(t, expected, actual)
+}
+
 // GetInputValueByID for get input value by id
 func (doc *HTMLDoc) GetInputValueByID(id string) string {
 	text, _ := doc.doc.Find("#" + id).Attr("value")