feat(linkding): Add linkding stack

Bookmarking software similar to shaarli but a bit more featureful. And
not written in php, thankfully.

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

@@ -0,0 +1,46 @@
+services:
+  app:
+    image: "{{ stack_image }}:{{ linkding_version }}"
+    healthcheck:
+      test: ["CMD", "curl", "--fail", "http://127.0.0.1:9090/health"]
+      interval: 1m
+      timeout: 10s
+      retries: 3
+      start_period: 1m
+    networks:
+      - "{{ docker_swarm_public_network_name }}"
+    volumes:
+    - data:/etc/linkding/data
+    environment:
+      - "LD_SUPERUSER_NAME={{ linkding_username }}"
+      - "LD_SUPERUSER_PASSWORD={{ linkding_password }}"
+{% if linkding_autoupdate is defined and linkding_autoupdate %}
+    deploy:
+      labels:
+        - shepherd.autoupdate=true
+{% endif %}
+
+{% if backup_enable is not undefined and not false and linkding_backup_enable is not undefined and not false %}
+  backup:
+    image: mazzolino/restic
+    environment:
+      - "TZ={{ restic_timezone }}"
+       # go-cron starts w seconds
+      - "BACKUP_CRON={{ linkding_backup_cron }}"
+      - "RESTIC_REPOSITORY={{ restic_repo }}"
+      - "AWS_ACCESS_KEY_ID={{ restic_s3_key }}"
+      - "AWS_SECRET_ACCESS_KEY={{ restic_s3_secret }}"
+      - "RESTIC_PASSWORD={{ restic_pass }}"
+      - "RESTIC_BACKUP_TAGS=linkding"
+      - "RESTIC_BACKUP_SOURCES=/volumes"
+    volumes:
+      - data:/volumes/linkding_data:ro
+{% endif %}
+
+volumes:
+  data:
+
+networks:
+  "{{ docker_swarm_public_network_name }}":
+    external: true
+

roles/linkding/templates/upstream.json.j2

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+{
+    "@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"
+                }
+            ]
+        }
+    ]
+}