ci: skip cppo_ocamlbuild in dependants

Author: Yishuai Li

.github/workflows/build.yml

@@ -147,6 +147,7 @@ jobs:
         run: |
           PACKAGES=$(opam list -s -V --color=never --installable --depends-on cppo,cppo_ocamlbuild | \
             awk '{
+              if ($0 ~ /^cppo_ocamlbuild\./) next
               line = $0
               dot = match(line, /\./)
               pkg = substr(line, 1, dot - 1)
@@ -184,7 +185,9 @@ jobs:
           foreach ($line in $rawPackages) {
               if ($line -match '^(.*?)[.]') {
                   $pkg = $matches[1]
-                  $packageMap[$pkg] = $line
+                  if ($pkg -ne "cppo_ocamlbuild") {
+                    $packageMap[$pkg] = $line
+                  }
               }
           }