Add wallabag docker deployment role

Added role of wallabag. Can take a subdomain alias to be presented on a
different uri than its stack name.

All services contain a healthcheck for docker swarm to be informed of
their status.

Copy whoami template to wallabag role

Change non-domain domain name to localhost

Fix correct handler notify naming

Allow setting different subdomain alias than name

Add meta information

roles/wallabag/templates/docker-stack.yml.j2

@@ -0,0 +1,36 @@
+version: "3.7"
+
+services:
+  app:
+    image: {{ stack_image }}:{{ wallabag_version }}
+    networks:
+      - "{{ docker_swarm_public_network_name }}"
+    healthcheck:
+        test: ["CMD", "curl", "-f", "http://localhost"]
+        interval: 1m
+        timeout: 10s
+        retries: 3
+        start_period: 1m
+    volumes:
+      - data:/var/www/wallabag/data
+    environment:
+      - SYMFONY__ENV__FOSUSER_REGISTRATION=false
+{% if server_domain is not undefined and not none %}   
+      - SYMFONY__ENV__DOMAIN_NAME={{ (wallabag_use_https == True) | ternary('https', 'http') }}://wallabag.{{ server_domain }}
+{% else %}
+      - SYMFONY__ENV__DOMAIN_NAME={{ (wallabag_use_https == True) | ternary('https', 'http') }}://localhost
+{% endif %}
+
+  redis:
+    image: redis:alpine
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 20s
+      timeout: 3s
+
+volumes:
+  data:
+
+networks:
+  "{{ docker_swarm_public_network_name }}":
+    external: true

roles/wallabag/templates/upstream.json.j2

@@ -0,0 +1,38 @@
+{
+    "@id": "{{ stack.name }}_upstream",
+{% if server_domain is not undefined and not none %}   
+    "match": [
+        {
+            "host": [
+{% if subdomain_alias is not undefined and not none %}
+                "{{ subdomain_alias }}.{{ server_domain }}"
+{% else %}
+                "{{ stack.name }}.{{ server_domain }}"
+{% endif %}
+            ]
+        }
+    ],
+{% else %}
+    "match": [
+        {
+            "path": [
+{% if subdomain_alias is not undefined and not none %}
+                "/{{ subdomain_alias }}*"
+{% else %}
+                "/{{ stack.name }}*"
+{% endif %}
+            ]
+        }
+    ],
+{% endif %}
+    "handle": [
+        {
+            "handler": "reverse_proxy",
+            "upstreams": [
+                {
+                    "dial": "{{ stack.name }}_app:80"
+                }
+            ]
+        }
+    ]
+}