test against Wagtail 2.11 and master

.github/workflows/test.yml

@@ -7,11 +7,13 @@ on:
   pull_request:
 
 # Current configuration:
-# - django 2.2, python 3.6, wagtail 2.6, postgres
+# - django 2.2, python 3.6, wagtail 2.6, sqlite
 # - django 2.2, python 3.7, wagtail 2.7, postgres
 # - django 3.0, python 3.8, wagtail 2.8, sqlite
 # - django 3.0, python 3.8, wagtail 2.9, postgres
-# - django 3.1, python 3.8, wagtail 2.10, postgres
+# - django 3.1, python 3.8, wagtail 2.10, sqlite
+# - django 3.1, python 3.8, wagtail 2.11, postgres
+# - django 3.1, python 3.9, wagtail master, postgres (allow failures)
 jobs:
   test:
     runs-on: ubuntu-latest
@@ -22,7 +24,7 @@ jobs:
           - python: 3.6
             django: "Django>=2.2,<2.3"
             wagtail: "wagtail>=2.6,<2.7"
-            database: "postgresql"
+            database: "sqlite3"
             experimental: false
           - python: 3.7
             django: "Django>=2.2,<2.3"
@@ -42,8 +44,18 @@ jobs:
           - python: 3.8
             django: "Django>=3.1,<3.2"
             wagtail: "wagtail>=2.10,<2.11"
+            database: "sqlite3"
+            experimental: false
+          - python: 3.8
+            django: "Django>=3.1,<3.2"
+            wagtail: "wagtail>=2.11,<2.12"
             database: "postgresql"
             experimental: false
+          - python: 3.9
+            django: "Django>=3.1,<3.2"
+            wagtail: "git+https://github.com/wagtail/wagtail.git@master#egg=wagtail"
+            database: "postgresql"
+            experimental: true
 
     services:
       postgres: