Add blackfire onto 8.1 version

Author: mistraloz

README.md

@@ -187,7 +187,7 @@ This list can be outdated, you can verify by executing : `docker run --rm -it th
 - *weakref* is not compatible with PHP 7.3+ (but weak references were added to the PHP core in PHP 7.4)
 - *sybase* extension is not available in v4 (use v3)
 - *event*, *gnupg* are not available in PHP 8.0+
-- *blackfire*, *gettext*, *ev*, *rdkafka*, *swoole* are not available in PHP 8.1+
+- *gettext*, *ev*, *rdkafka*, *swoole* are not available in PHP 8.1+
 
 ### Enabling/disabling extensions in the fat image
 

extensions/8.1/blackfire

@@ -0,0 +1 @@
+../core/blackfire

utils/README.blueprint.md

@@ -105,7 +105,7 @@ This list can be outdated, you can verify by executing : `docker run --rm -it th
 - *weakref* is not compatible with PHP 7.3+ (but weak references were added to the PHP core in PHP 7.4)
 - *sybase* extension is not available in v4 (use v3)
 - *event*, *gnupg* are not available in PHP 8.0+
-- *blackfire*, *gettext*, *ev*, *rdkafka*, *swoole* are not available in PHP 8.1+
+- *gettext*, *ev*, *rdkafka*, *swoole* are not available in PHP 8.1+
 
 ### Enabling/disabling extensions in the fat image