build: try to exclude directory through composer settings

Signed-off-by: Bart Jaskulski <bjaskulski@protonmail.com>

composer.json

@@ -40,5 +40,8 @@
 		"phpunit-unit-fast": "phpunit --configuration phpunit-unit.xml --no-coverage",
 		"phpunit-integration": "phpunit --configuration phpunit-integration.xml --coverage-text --colors=never",
 		"phpunit-integration-fast": "phpunit --configuration phpunit-integration.xml --no-coverage"
+	},
+	"archive": {
+		"exclude": ["/tests"]
 	}
 }