Remove stable12 from drone tests

Signed-off-by: Julius Härtl <jus@bitgrid.net>

.drone.yml

@@ -22,11 +22,11 @@ pipeline:
     when:
       matrix:
         TESTS: check-app-compatbility
-  check-app-compatbility-12:
+  check-app-compatbility-13:
     image: nextcloudci/php7.0:php7.0-17
     environment:
       - APP_NAME=deck
-      - CORE_BRANCH=stable12
+      - CORE_BRANCH=stable13
       - DB=sqlite
     commands:
       # Pre-setup steps
@@ -40,24 +40,6 @@ pipeline:
     when:
       matrix:
         TESTS: check-app-compatbility-13
-  check-app-compatbility-12:
-    image: nextcloudci/php7.0:php7.0-17
-    environment:
-      - APP_NAME=deck
-      - CORE_BRANCH=stable12
-      - DB=sqlite
-    commands:
-      # Pre-setup steps
-      - wget https://raw.githubusercontent.com/nextcloud/travis_ci/master/before_install.sh
-      - bash ./before_install.sh $APP_NAME $CORE_BRANCH $DB
-      - cd ../server
-      # Code checker
-      - ./occ app:check-code $APP_NAME -c strong-comparison
-      - ./occ app:check-code $APP_NAME -c deprecation
-      - cd apps/$APP_NAME/
-    when:
-      matrix:
-        TESTS: check-app-compatbility-12
   signed-off-check:
     image: nextcloudci/php7.0:php7.0-17
     environment:
@@ -230,7 +212,6 @@ pipeline:
 matrix:
   include:
     - TESTS: check-app-compatbility
-    - TESTS: check-app-compatbility-12
     - TESTS: check-app-compatbility-13
     - TESTS: signed-off-check
     - TESTS: syntax-php5.6