Fix composer install command execution for extensions and skins (#491)

* Fix composer install command execution for extensions and skins

* Update extensions-skins.php

Author: sanjay-thiyagarajan

_sources/scripts/extensions-skins.php

@@ -70,8 +70,8 @@
     if ($additionalSteps !== null) {
         foreach ($additionalSteps as $step) {
             if ($step === "composer update") {
-                $composerUpdateCmd = "cd $MW_HOME/$type/$name && composer update --no-dev";
-                exec($composerUpdateCmd);
+                $composerInstallCmd = "cd $MW_HOME/$type/$name && COMPOSER_HOME=$MW_HOME composer install --no-interaction";
+                shell_exec("$composerInstallCmd");
             } elseif ($step === "git submodule update") {
                 $submoduleUpdateCmd = "cd $MW_HOME/$type/$name && git submodule update --init";
                 exec($submoduleUpdateCmd);