.github: run e2e tests on newer ubuntu

I cannot reproduce chromedp panics locally so trying to see if a newer
Ubuntu version would help.

Signed-off-by: Giedrius Statkevičius <[email protected]>
Signed-off-by: Yi Jin <[email protected]>

Author: GiedriusS

.github/workflows/go.yaml

@@ -147,7 +147,7 @@ jobs:
       matrix:
         parallelism: [8]
         index: [0, 1, 2, 3, 4, 5, 6, 7]
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     name: Thanos end-to-end tests
     env:
       GOBIN: /tmp/.bin

test/e2e/query_test.go

@@ -1248,32 +1248,20 @@ func TestSidecarQueryEvaluation(t *testing.T) {
 	}
 }
 
-// An emptyCtx is never canceled, has no values, and has no deadline. It is not
-// struct{}, since vars of this type must have distinct addresses.
-type emptyCtx int
+var chromedpAllocator context.Context
 
-func (*emptyCtx) Deadline() (deadline time.Time, ok bool) {
-	return
-}
-
-func (*emptyCtx) Done() <-chan struct{} {
-	return nil
-}
-
-func (*emptyCtx) Err() error {
-	return nil
-}
-
-func (*emptyCtx) Value(key any) any {
-	return nil
-}
-
-func (e *emptyCtx) String() string {
-	return "Context"
+func TestMain(m *testing.M) {
+	execAlloc, execCancel := chromedp.NewExecAllocator(
+		context.Background(),
+	)
+	chromedpAllocator = execAlloc
+	rc := m.Run()
+	execCancel()
+	os.Exit(rc)
 }
 
 func checkNetworkRequests(t *testing.T, addr string) {
-	ctx, cancel := chromedp.NewContext(new(emptyCtx))
+	ctx, cancel := chromedp.NewContext(chromedpAllocator)
 	t.Cleanup(cancel)
 
 	testutil.Ok(t, runutil.Retry(1*time.Minute, ctx.Done(), func() error {