Add CI workflow, Dependabot, and testcontainers infrastructure

.github/dependabot.yml

@@ -0,0 +1,11 @@
+version: 2
+updates:
+  - package-ecosystem: "pip"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/workflows/ci.yml

@@ -0,0 +1,37 @@
+name: CI
+
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+      - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
+        with:
+          python-version: "3.13"
+          cache: "pip"
+      - name: Install dependencies
+        run: pip install -e ".[dev]"
+      - name: Check linting
+        run: ruff check .
+      - name: Check formatting
+        run: ruff format --check .
+
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+      - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
+        with:
+          python-version: "3.13"
+          cache: "pip"
+      - name: Install dependencies
+        run: pip install -e ".[dev]"
+      - name: Run tests
+        run: pytest tests/ --cov=haystack_integrations --cov-report=term-missing -v

docs/plans/2026-03-18-project-infrastructure-design.md

@@ -0,0 +1,89 @@
+# Project Infrastructure Design
+
+## Overview
+
+Set up CI, Dependabot, and foundational project infrastructure for the `arcadedb-haystack` project hosted on GitHub under the `ArcadeData` org.
+
+## Dependabot
+
+**File:** `.github/dependabot.yml`
+
+Two ecosystems, both on a weekly schedule targeting `main`:
+
+- **pip** — monitors `pyproject.toml` for dependency updates
+- **github-actions** — monitors workflow action versions (e.g., `actions/checkout`, `actions/setup-python`)
+
+No auto-merge, no grouping, no reviewers. The ArcadeDB Docker image version is updated manually (not tracked by Dependabot).
+
+## CI Workflow
+
+**File:** `.github/workflows/ci.yml`
+
+**Triggers:** pull request to main, push to main, `workflow_dispatch`
+
+### Job 1: `lint`
+
+- Runs on `ubuntu-latest`, Python 3.13
+- Installs Ruff
+- Runs `ruff check .` and `ruff format --check .`
+
+### Job 2: `test`
+
+- Runs on `ubuntu-latest`, Python 3.13
+- Installs project with dev dependencies (`pip install -e .` + dev deps)
+- Tests use `testcontainers` to spin up `arcadedata/arcadedb:26.3.1` with a readiness check on the HTTP API (`/api/v1/ready` on port 2480)
+- Runs `pytest tests/` with coverage
+- Docker is pre-installed on GitHub Actions runners
+
+## File Changes
+
+### New files
+
+| File | Purpose |
+|------|---------|
+| `.github/dependabot.yml` | Dependabot configuration |
+| `.github/workflows/ci.yml` | CI workflow with lint + test jobs |
+
+### Modified files
+
+| File | Change |
+|------|--------|
+| `pyproject.toml` | Add `testcontainers`, `docker`, and `ruff` to dev dependencies |
+| `tests/test_document_store.py` | Refactor to use a `testcontainers` fixture (module-scoped) instead of requiring a pre-running ArcadeDB instance |
+
+### Unchanged files
+
+| File | Reason |
+|------|--------|
+| `tests/test_filters.py` | Pure unit tests, no ArcadeDB dependency |
+
+## Testcontainers Fixture Pattern
+
+Following the pattern from `e2e-python/tests/test_arcadedb.py`:
+
+```python
+from testcontainers.core.container import DockerContainer
+
+ARCADEDB_IMAGE = "arcadedata/arcadedb:26.3.1"
+
+arcadedb = (
+    DockerContainer(ARCADEDB_IMAGE)
+    .with_exposed_ports(2480)
+    .with_env("JAVA_OPTS", "-Darcadedb.server.rootPassword=arcadedb")
+)
+
+@pytest.fixture(scope="module", autouse=True)
+def arcadedb_container():
+    arcadedb.start()
+    wait_for_http_endpoint(arcadedb, "/api/v1/ready", 2480, 204, timeout=30)
+    yield arcadedb
+    arcadedb.stop()
+```
+
+The `_store()` helper will resolve the URL from the container's mapped host/port.
+
+## Out of Scope
+
+- Release/publish workflow to PyPI (manual for now)
+- Python version matrix (3.13 only)
+- Docker image version tracking via Dependabot (manual updates)