alpine support

.drone.yml

@@ -0,0 +1,56 @@
+kind: pipeline
+name: default
+
+steps:
+- name: php7.4  
+  image: plugins/docker
+  settings:
+    username: 
+      from_secret: hub_username
+    password: 
+      from_secret: hub_password
+    repo: 
+      from_secret: hub_repo
+    build_args:
+      - PHP_VERSION=7.4-fpm-alpine3.13
+    tags: 7.4-alpine
+  when: 
+    branch:
+      - alpine
+  depends_on: [ clone ]
+
+- name: php7.3
+  image: plugins/docker
+  settings:
+    username: 
+      from_secret: hub_username
+    password: 
+      from_secret: hub_password
+    repo: 
+      from_secret: hub_repo
+    build_args:
+      - PHP_VERSION=7.3-fpm-alpine3.12
+    tags: 7.3-alpine
+  when: 
+    branch:
+      - alpine
+  depends_on: [ clone ]
+
+- name: php7.2
+  image: plugins/docker
+  settings:
+    username: 
+      from_secret: hub_username
+    password: 
+      from_secret: hub_password
+    repo: 
+      from_secret: hub_repo
+    build_args:
+      - PHP_VERSION=7.2-fpm-alpine3.12
+    tags: 7.2-alpine
+  when: 
+    branch:
+      - alpine
+  depends_on: [ clone ]
+
+