Download pickle only when really needed (#551)

* We don't use pecl to install geos

* We don't use pecl when installing an extension from source

* Don't run PHP 8.1 tests on Alpine 3.13

We don't have an Alpine 3.13 distro coming with PHP 8.1

Test: geos

.github/workflows/monitor-php8.1.yml

@@ -13,7 +13,6 @@ jobs:
       fail-fast: false
       matrix:
         distro:
-          - alpine3.13
           - alpine3.14
           - alpine3.15
           - buster

install-php-extensions

@@ -3304,10 +3304,13 @@ moduleMayUsePecl() {
 		@composer | @fix_letsencrypt)
 			return 1
 			;;
-		blackfire | ioncube_loader | snuffleupagus | sourceguardian | spx | tdlib)
+		blackfire | geos | ioncube_loader | snuffleupagus | sourceguardian | spx | tdlib)
 			return 1
 			;;
 	esac
+	if test -n "$(getModuleSourceCodePath "$1")"; then
+		return 1
+	fi
 	if stringInList "$1" "$BUNDLED_MODULES"; then
 		return 1
 	fi