Update container argument_specs, add alpine role as a template

roles/alpine/README.md

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+Sets up an alpine docker container. To be used as a template for other roles.

roles/alpine/meta/argument_specs.yml

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+---
+
+argument_specs:
+  main:
+    short_description: Alpine container
+    description: "Sets up an alpine docker container. This role can be used as a template for other roles using the container role."
+    options:
+
+      # All options after this will be passed directly to the container role
+      docker_service_suffix:
+        description: "A suffix used to allow running multiple instances of the same service on a host. If docker_service is gitea and docker_service_suffix production, the container will be gitea_production"
+        type: str
+        required: false
+      docker_host_user:
+        description: "If true, creates a user on the host for this service. The container will run as this user's uid/gid. Bind mount volumes will be owned by this user."
+        type: bool
+        required: false
+        default: true
+
+      databse_passwords:
+        description: "database_passwords[docker_service] is a string with the password used for communication between the service and database. Required if docker_database is postgres or mariadb"
+        type: dict
+        required: false
+      docker_additional_services:
+        description: "List of additional services to configure (in separate containers). These will be accessible with hostname <docker_service_name>[_suffix]_<additional_service>"
+        type: list
+        required: false
+        elements: str
+        choices:
+          - memcached
+        default: []
+
+      docker_volume_type:
+        description: "Defines whether to use named volumes or bind mounts for mounts with name"
+        type: str
+        required: false
+        choices:
+          - named
+          - bind
+        default: named
+      reverse_proxy_type:
+        description: "Defines which kind of reverse proxy to configure for the container. Traefik support is experimental."
+        type: str
+        required: false
+        choices:
+          - caddy
+          - traefik
+          - none
+        default: caddy
+      ports:
+        description: "ports[docker_service]['http'] or ports[docker_service]['https'] defines the port on which the container will listen on for reverse proxy connections. Required if reverse_proxy_type is caddy."
+        type: dict
+      docker_vhost_domains:
+        description: "docker_vhost_domains[docker_service] is a list which defines which domains should be proxied to the container. Required if reverse_proxy_type is not none"
+        type: dict
+      docker_entrypoint:
+        description: "Docker entrypoint as list of command and arguments"
+        type: list
+        required: false
+        elements: str

roles/alpine/tasks/main.yml

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+---
+
+- name: Alpine container
+  import_role:
+    name: container
+  vars:
+    docker_service: alpine
+    docker_image: alpine
+    docker_image_http_port: 8080
+    docker_database: postgres
+    docker_mounts:
+      - name: data
+        path: /data
+    docker_env:
+      TZ: "{{ timezone }}"