add a binary installation method

defaults/main.yml

@@ -1,3 +1,6 @@
 ---
 caddy_config_sites_directory: "/etc/caddy/sites.d"
 caddy_config_sites_clear: false
+caddy_installation_method: "apt"
+
+caddy_download_url: "https://caddyserver.com/api/download?os=linux&arch=amd64"

tasks/install_bin.yml

@@ -0,0 +1,39 @@
+---
+- name: Create caddy user
+  user:
+    state: present
+    name: "caddy"
+    groups:
+      - "www-data"
+    append: true
+    shell: "/usr/sbin/nologin"
+    home: "/var/lib/caddy"
+    comment: "Caddy web server"
+    system: yes
+
+- name: Download caddy binary
+  get_url:
+    url: "{{ caddy_download_url }}"
+    dest: "/usr/bin/caddy"
+    owner: "root"
+    group: "root"
+    mode: 0755
+
+- name: Create caddy configuration directory
+  file:
+    path: "/etc/caddy"
+    owner: "caddy"
+    group: "caddy"
+    state: directory
+
+- name: Template caddy systemd-service
+  template:
+    src: "caddy.service.j2"
+    dest: "/etc/systemd/system/caddy.service"
+
+- name: Enable and start caddy systemd-service
+  systemd:
+    name: "caddy.service"
+    daemon_reload: yes
+    enabled: yes
+    state: started

tasks/main.yml

@@ -1,4 +1,5 @@
 ---
-- import_tasks: "install.yml"
+- import_tasks: "install_{{ caddy_installation_method }}.yml"
+
 - import_tasks: "configuration.yml"
 

templates/caddy.service.j2

@@ -0,0 +1,35 @@
+# caddy.service
+#
+# For using Caddy with a config file.
+#
+# Make sure the ExecStart and ExecReload commands are correct
+# for your installation.
+#
+# See https://caddyserver.com/docs/install for instructions.
+#
+# WARNING: This service does not use the --resume flag, so if you
+# use the API to make changes, they will be overwritten by the
+# Caddyfile next time the service is restarted. If you intend to
+# use Caddy's API to configure it, add the --resume flag to the
+# `caddy run` command or use the caddy-api.service file instead.
+
+[Unit]
+Description=Caddy
+Documentation=https://caddyserver.com/docs/
+After=network.target network-online.target
+Requires=network-online.target
+
+[Service]
+User=caddy
+Group=caddy
+ExecStart=/usr/bin/caddy run --environ --config /etc/caddy/Caddyfile
+ExecReload=/usr/bin/caddy reload --config /etc/caddy/Caddyfile
+TimeoutStopSec=5s
+LimitNOFILE=1048576
+LimitNPROC=512
+PrivateTmp=true
+ProtectSystem=full
+AmbientCapabilities=CAP_NET_BIND_SERVICE
+
+[Install]
+WantedBy=multi-user.target