Test against stable releases

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

.drone.yml

@@ -5,7 +5,7 @@ steps:
   image: nextcloudci/php7.3:latest
   environment:
     APP_NAME: deck
-    CORE_BRANCH: master
+    CORE_BRANCH: stable20
     DB: sqlite
   commands:
     # Pre-setup steps
@@ -20,7 +20,7 @@ steps:
   image: nextcloudci/php7.2:latest
   environment:
     APP_NAME: deck
-    CORE_BRANCH: master
+    CORE_BRANCH: stable20
     DB: sqlite
   commands:
     - composer install
@@ -29,7 +29,7 @@ steps:
   image: nextcloudci/php7.3:php7.3-2
   environment:
     APP_NAME: deck
-    CORE_BRANCH: master
+    CORE_BRANCH: stable20
     DB: sqlite
   commands:
     - composer install
@@ -38,7 +38,7 @@ steps:
   image: nextcloudci/php7.4:latest
   environment:
       APP_NAME: deck
-      CORE_BRANCH: master
+      CORE_BRANCH: stable20
       DB: sqlite
   commands:
       - composer install
@@ -58,7 +58,7 @@ steps:
     image: nextcloudci/php7.3:latest
     environment:
       APP_NAME: deck
-      CORE_BRANCH: master
+      CORE_BRANCH: stable20
       DB: sqlite
     commands:
       # Pre-setup steps
@@ -84,7 +84,7 @@ steps:
     image: nextcloudci/php7.4:latest
     environment:
       APP_NAME: deck
-      CORE_BRANCH: master
+      CORE_BRANCH: stable20
       DB: sqlite
     commands:
       # Pre-setup steps
@@ -111,7 +111,7 @@ steps:
     image: nextcloudci/php7.3:latest
     environment:
       APP_NAME: deck
-      CORE_BRANCH: master
+      CORE_BRANCH: stable20
       DB: sqlite
     commands:
       # Pre-setup steps

.travis.yml

@@ -2,9 +2,13 @@ language: php
 services:
     - mysql
 php:
+    - 7.2
     - 7.3
+    - 7.4
 env:
-    - CORE_BRANCH=master DB=mysql
+    - CORE_BRANCH=stable20 DB=mysql
+    - CORE_BRANCH=stable19 DB=mysql
+    - CORE_BRANCH=stable18 DB=mysql
 
 matrix:
   include: