maintner/maintnerd/maintapi: test x/website with Go 1.16 longer

Provide TryBot test coverage in x/website using Go 1.16
while that version is still used during its deployment.

For golang/go#51800.

Change-Id: I4b1361537a8af8322ec62c86891de46143758c4e
Reviewed-on: https://go-review.googlesource.com/c/build/+/393858
Trust: Dmitri Shuralyov <[email protected]>
Run-TryBot: Dmitri Shuralyov <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Reviewed-by: Heschi Kreinick <[email protected]>
Auto-Submit: Dmitri Shuralyov <[email protected]>

Author: dmitshur

maintner/maintnerd/maintapi/api.go

@@ -209,6 +209,14 @@ func tryWorkItem(
 				w.GoBranch = append(w.GoBranch, r.BranchName)
 				w.GoVersion = append(w.GoVersion, &apipb.MajorMinor{Major: r.Major, Minor: r.Minor})
 			}
+
+			// Test x/website with Go 1.16.15 in addition to the supportedReleases above.
+			// TODO(go.dev/issue/51800): Remove this once x/website deployment is updated.
+			if w.Project == "website" {
+				w.GoCommit = append(w.GoCommit, "7de0c90a1771146bcba5663fb257c52acffe6161") // go1.16.15 tag.
+				w.GoBranch = append(w.GoBranch, "release-branch.go1.16")
+				w.GoVersion = append(w.GoVersion, &apipb.MajorMinor{Major: 1, Minor: 16})
+			}
 		} else {
 			// A branch that is neither internal-branch.goX.Y-suffix nor "master":
 			// maybe some custom branch like "dev.go2go".