Model the build on mozimo and target emily

- Makefile: PLATFORMS, tags :<commit> and :main, build-check with --pull.
- deploy.sh: push, guards, git pull --ff-only, optional --prune, image_tag.
- Replace .containerignore with .dockerignore.
- Add the opt-in image prune to the hops role.
- Tag the Caddyfile task so --skip-tags caddy works before DNS cutover.
- Trim comments and rewrite build and deploy text in plain prose.

ansible/roles/register/tasks/main.yaml

@@ -1,18 +1,6 @@
 ---
-# Register Hops n Grains' network with the shared Caddy unit.
-#
-# Caddy is the base unit (caddy/playbook.yml in the ansible-playbooks repo) and
-# knows nothing about its upstreams. A service adds itself by writing two files
-# into the Quadlet directory:
-#
-#   1. its own hops.network unit, and
-#   2. a drop-in next to caddy.container that pulls that network into Caddy.
-#
-# This mirrors ansible-playbooks/caddy/roles/register/tasks/main.yaml, vendored
-# so this repo's deploy.sh stands on its own. Keep the bytes in sync with it.
-#
-# Included from playbook.yml's pre_tasks, before the app unit is generated. Runs
-# as the connection user, which must be {{ podman_user }}.
+# Write hops.network and the Caddy drop-in that joins Caddy to it.
+# Run from pre_tasks, before the app unit is generated.
 
 - name: Ensure the Quadlet directory exists
   ansible.builtin.file:
@@ -29,15 +17,8 @@
     group: "{{ podman_user }}"
     mode: '0644'
     content: |
-      # {{ network_name }} — logical app network.
-      # Managed by Ansible. Do not edit by hand.
-      #
-      # NetworkName pins the Podman network name. Without it Quadlet would
-      # create "systemd-{{ network_name }}".
-      #
-      # isolate blocks traffic between separate Podman networks, so a container
-      # on this network cannot reach one that is only on another. Caddy still
-      # reaches it, because it is a member of it.
+      # {{ network_name }} network unit. Managed by Ansible.
+      # NetworkName pins the Podman name to {{ network_name }}_net.
       [Network]
       NetworkName={{ network_name }}_net
       Options=isolate=true
@@ -58,10 +39,8 @@
     group: "{{ podman_user }}"
     mode: '0644'
     content: |
-      # Added by Hops n Grains' playbook. Do not edit by hand.
-      #
-      # Quadlet merges this into caddy.container. Deleting this file removes
-      # the network from Caddy on the next daemon-reload.
+      # Added by the Hops n Grains playbook. Managed by Ansible.
+      # Quadlet merges this into caddy.container.
       [Container]
       Network={{ network_name }}.network
   notify: Restart Caddy