CI Localenv -> Initial automation of backend rollout.

.ci/deploy/localenv/ansible/README.md

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+## How to use
+
+1. Install Ansible on your machine, e.g on Debian-based systems:
+```sh
+sudo apt install ansible
+```
+
+2. Define an inventory.ini with parameters for your hosts.
+
+3. Make sure you have entries in your SSH config for all the hosts declared in the inventory.ini.
+
+4. Run the script like so:
+```sh
+./playbook.yaml -i inventory.ini
+```

.ci/deploy/localenv/ansible/ansible.cfg

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+[defaults]
+stdout_callback=debug

.ci/deploy/localenv/ansible/playbook.yaml

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+#!/usr/bin/env ansible-playbook
+---
+- name: Roll out openDuT Backend
+  # Setup steps as documented here: https://opendut.eclipse.dev/book/user-manual/carl/setup.html
+  hosts: backend
+  tasks:
+  - name: Checkout openDuT repo
+    ansible.builtin.git:
+      repo: "https://github.com/eclipse-opendut/opendut/"
+      dest: "{{ repo_dir }}"
+      version: "development"
+      force: true  # Avoid "would clobber existing tag" error for canary-tag
+
+  - name: Provision secrets
+    ansible.builtin.shell:
+      cmd: "docker compose --file .ci/deploy/localenv/docker-compose.yml up --build provision-secrets"
+      chdir: "{{ repo_dir }}"
+      creates: "{{ repo_dir }}/.ci/deploy/localenv/data/secrets/.env"
+
+  - name: Start containers
+    ansible.builtin.shell:
+      cmd: "docker compose --file .ci/deploy/localenv/docker-compose.yml --env-file .ci/deploy/localenv/data/secrets/.env up --detach --build"
+      chdir: "{{ repo_dir }}"