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The docker role was installing docker-compose-plugin which is only
available from Docker's official apt repository. helsinki-a had it
configured manually, but london-b and copenhagen-a did not, causing
deploy failures.
Now the role:
- Adds Docker's GPG key and apt repo (handles both Debian and Ubuntu)
- Installs docker-ce, docker-ce-cli, containerd.io, docker-compose-plugin
- Removes conflicting stock packages (docker.io, docker-compose)
- Docker role: replace docker-compose with docker-compose-plugin (v2).
The old docker-compose package conflicts with docker-compose-plugin
already installed on helsinki-a. Also removes the conflicting package
if present.
- firewall_alpine handler: use ansible.builtin.shell instead of
ansible.builtin.command for iptables-restore, since the redirect
operator (<) requires a shell.
