ci: configure tests with zuul

Change-Id: Idc12626b86f2011259acd97c4d69c79f910fb12d
Reviewed-on: https://gerrit.stoatinternal.com/c/stoatchat/+/227
Tested-by: Zuul
Reviewed-by: insert <insert@stoat.chat>

.zuul.yaml

@@ -0,0 +1,22 @@
+- job:
+    name: stoatchat-rust
+    parent: rust-docker
+    description: Build the workspace and run the tests against the reference and MongoDB databases.
+    nodeset:
+      nodes:
+        - name: container
+          label: pod-rust
+        - name: docker
+          label: docker-namespace
+    semaphores:
+      - stoatchat-rust
+    run: .zuul/playbooks/rust.yaml
+    timeout: 3600
+
+- project:
+    check:
+      jobs:
+        - stoatchat-rust
+    gate:
+      jobs:
+        - stoatchat-rust

.zuul/compose.mirror.yml

@@ -0,0 +1,13 @@
+services:
+  redis:
+    image: docker.io/eqalpha/keydb
+  database:
+    image: docker.io/library/mongo
+  minio:
+    image: docker.io/pgsty/silo
+  createbuckets:
+    image: docker.io/pgsty/mc
+  rabbit:
+    image: docker.io/library/rabbitmq:4-management
+  maildev:
+    image: docker.io/maildev/maildev:2.2.1

.zuul/playbooks/rust.yaml

@@ -0,0 +1,90 @@
+- hosts: container
+  tasks:
+    - name: Read the Docker daemon's address
+      command: cat /etc/docker-host
+      register: docker_host_file
+
+- hosts: container
+  vars:
+    docker_ip: "{{ docker_host_file.stdout | trim }}"
+  environment:
+    PATH: "/root/.local/bin:/root/.local/share/mise/shims:{{ ansible_env.PATH }}"
+    MISE_YES: "1"
+    MISE_DISABLE_TOOLS: node,pnpm,gh,github:git-town/git-town
+    CARGO_TERM_COLOR: always
+    DOCKER_HOST: "tcp://{{ docker_ip }}:2375"
+  tasks:
+    - name: Install system libraries
+      shell: apt-get update && apt-get install --yes libdav1d-dev pkg-config socat
+
+    - name: Install mise
+      shell: curl -fsSL https://mise.run | MISE_VERSION=v2026.10.8 sh
+
+    - name: Install tools
+      shell: |
+        mise trust
+        mise use -g cargo-binstall docker-cli docker-compose
+        mise install
+        mkdir -p ~/.docker/cli-plugins
+        ln -sf "$(mise which docker-compose)" ~/.docker/cli-plugins/docker-compose
+      args:
+        chdir: "{{ zuul.project.src_dir }}"
+
+    - name: Wait for Docker
+      command: docker info
+      register: docker_info
+      until: docker_info.rc == 0
+      retries: 30
+      delay: 2
+
+    - name: Point the tests at the services on the Docker node
+      shell: cat > Revolt.test-overrides.toml
+      args:
+        chdir: "{{ zuul.project.src_dir }}"
+        stdin: |
+          [database]
+          mongodb = "mongodb://{{ docker_ip }}:27017/?directConnection=true"
+          redis = "redis://{{ docker_ip }}:6379/"
+
+          [rabbit]
+          host = "{{ docker_ip }}"
+
+          [files.s3]
+          endpoint = "http://{{ docker_ip }}:14009"
+
+          [api.smtp]
+          host = "{{ docker_ip }}"
+
+    - name: Forward maildev's web API, which the tests reach at localhost:14080
+      shell: setsid nohup socat TCP-LISTEN:14080,fork,reuseaddr TCP:{{ docker_ip }}:14080 > /dev/null 2>&1 &
+
+    - name: Start services
+      command: mise run docker:start
+      args:
+        chdir: "{{ zuul.project.src_dir }}"
+      environment:
+        COMPOSE_FILE: compose.yml:.zuul/compose.mirror.yml
+
+    - name: Build
+      command: mise run build
+      args:
+        chdir: "{{ zuul.project.src_dir }}"
+
+    - name: Test against the reference database
+      command: mise run test
+      args:
+        chdir: "{{ zuul.project.src_dir }}"
+      environment:
+        TEST_DB: REFERENCE
+
+    - name: Test against MongoDB
+      command: mise run test
+      args:
+        chdir: "{{ zuul.project.src_dir }}"
+      environment:
+        TEST_DB: MONGODB
+        MONGODB: "mongodb://{{ docker_ip }}:27017/?directConnection=true"
+
+    - name: Show cache statistics
+      command: sccache --show-stats
+      failed_when: false