[feature] Add support for Debian Bullseye/redis 6 #285

Closes #285

Co-authored-by: Gagan Deep <pandafy.dev@gmail.com>

Author: peschmae

.github/workflows/ci.yml

@@ -24,6 +24,7 @@ jobs:
           - ubuntu1804
           - ubuntu2004
           - debian10
+          - debian11
 
     steps:
       - uses: actions/checkout@v2

molecule/local/molecule.yml

@@ -32,6 +32,13 @@ platforms:
       - /sys/fs/cgroup:/sys/fs/cgroup:ro
     privileged: true
     pre_build_image: true
+  - name: "openwisp2-debian11"
+    image: "geerlingguy/docker-debian11-ansible:latest"
+    command: ${MOLECULE_DOCKER_COMMAND:-""}
+    volumes:
+      - /sys/fs/cgroup:/sys/fs/cgroup:ro
+    privileged: true
+    pre_build_image: true
 provisioner:
   name: ansible
   env:

tasks/apt.yml

@@ -32,6 +32,16 @@
   register: result
   until: result is success
 
+- name: Install redis 6 if available
+  apt:
+    name: "redis-server=5:6*"
+  notify:
+    - reload systemd
+    - start redis
+  ignore_errors: true
+  register: use_redis6
+  when: openwisp2_redis_install
+
 - name: Install redis 5 if available
   apt:
     name: "redis-server=5:5*"
@@ -40,16 +50,16 @@
     - start redis
   ignore_errors: true
   register: use_redis5
-  when: openwisp2_redis_install
+  when: openwisp2_redis_install and use_redis6 is failed
 
 - name: Install redis 4 (fallback)
-  when: openwisp2_redis_install and use_redis5.failed
+  when: openwisp2_redis_install and (use_redis5 is failed and use_redis6 is failed)
   apt:
     name: "redis-server=5:4*"
+  register: use_redis4
   notify:
     - reload systemd
     - start redis
-  ignore_errors: true
 
 # On the newer versions of redis, by default redis
 # binds to localhost on ipv6 address which wouldn't

tasks/pip.yml

@@ -80,7 +80,7 @@
     - molecule-idempotence-notest
 
 - name: Pin channels_redis to 2.4 for redis 4 compatibility
-  when: use_redis5 is defined and use_redis5.failed is defined and use_redis5.failed
+  when: use_redis4 is defined and use_redis4 is succeeded
   pip:
     name:
       - channels_redis~=2.4