drop support for alpine versions older than 3.15

.gitlab-ci.yml

@@ -3,14 +3,14 @@
     matrix:
 
     - PHP_VERSION: "7"
-      ALPINE_VERSION: ["3.15", "3.14", "3.13", "3.12", "3.11", "3.10", "3.9"]
+      ALPINE_VERSION: ["3.15"]
       TESTING_REPO: 0
       PHP_SESSION: 1
 
     - PHP_VERSION: "8"
       TESTING_REPO: 0
       PHP_SESSION: 1
-      ALPINE_VERSION: ["3.16", "3.15", "3.14", "3.13"]
+      ALPINE_VERSION: ["3.16", "3.15"]
 
     - PHP_VERSION: "81"
       ALPINE_VERSION: ["3.16", "3.17", "3.18", "3.19"]

Readme.md

@@ -33,11 +33,4 @@ The Image is available in multiple PHP and alpine versions. The following tag na
 |8.1|3.19|81-3.19||
 |8.0|3.16|8-3.16||
 |8.0|3.15|8-3.15||
-|8.0|3.14|8-3.14||
-|8.0|3.13|8-3.13||
 |7.4|3.15|7-3.15||
-|7.4|3.14|7-3.14||
-|7.4|3.13|7-3.13||
-|7.3|3.12|7-3.12||
-|7.3|3.11|7-3.11||
-|7.3|3.10|7-3.10||