dashboard: disable pkgsite on misc-compile-aix-ppc64 builder

It doesn't build for the same reason the vulndb repo doesn't build: a
dependency on github.com/go-git/go-billy.

For golang/go#49218
For golang/go#61209

Change-Id: I220a56ee330ec6de6d6467c6ca71e7f536121462
Reviewed-on: https://go-review.googlesource.com/c/build/+/508655
Auto-Submit: Carlos Amedee <carlos@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Run-TryBot: Michael Matloob <matloob@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

dashboard/builders.go

@@ -3154,10 +3154,9 @@ func init() {
 		},
 		buildsRepo: func(repo, branch, goBranch string) bool {
 			switch repo {
-			case "vulndb", "vuln":
-				// vulndb currently uses a dependency which does not build cleanly
-				// on aix-ppc64. Until that issue is resolved, skip vulndb on
-				// this builder.
+			case "vulndb", "vuln", "pkgsite":
+				// vulndb and pkgsite currently use a dependency which does not build cleanly
+				// on aix-ppc64. Until that issue is resolved, skip vulndb on this builder.
 				// (https://go.dev/issue/49218).
 				return false
 			}