diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..9e57955
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,48 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: Build and Test
+    runs-on: ubuntu-latest
+
+    env:
+      MIX_ENV: test
+      ELIXIR_VERSION: "1.17.3"
+      OTP_VERSION: "27.2"
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Elixir
+        uses: erlef/setup-beam@v1
+        with:
+          elixir-version: ${{ env.ELIXIR_VERSION }}
+          otp-version: ${{ env.OTP_VERSION }}
+
+      - name: Cache deps
+        uses: actions/cache@v4
+        with:
+          path: |
+            deps
+            _build
+          key: ${{ runner.os }}-mix-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ hashFiles('mix.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-mix-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-
+
+      - name: Install dependencies
+        run: mix deps.get
+
+      - name: Compile
+        run: mix compile --warnings-as-errors
+
+      - name: Run tests
+        run: mix test
diff --git a/.gitignore b/.gitignore
index 53bde0c..a004d20 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,6 +3,8 @@
 /deps/
 /data.db
 /data.db-*
+/test_data.db
+/test_data.db-*
 erl_crash.dump
 
 # Generated files
diff --git a/config/test.exs b/config/test.exs
index f2c328c..cf32957 100644
--- a/config/test.exs
+++ b/config/test.exs
@@ -1,5 +1,5 @@
 import Config
 
 config :items_api, ItemsApi.Repo,
-  database: ":memory:",
+  database: "./test_data.db",
   pool: Ecto.Adapters.SQL.Sandbox
diff --git a/lib/items_api/repo.ex b/lib/items_api/repo.ex
index ac82d62..1345d2b 100644
--- a/lib/items_api/repo.ex
+++ b/lib/items_api/repo.ex
@@ -4,7 +4,10 @@ defmodule ItemsApi.Repo do
     adapter: Ecto.Adapters.SQLite3
 
   def init(_type, config) do
-    config = Keyword.put(config, :database, "./data.db")
-    {:ok, config}
+    database =
+      System.get_env("DATABASE_PATH") ||
+        Keyword.get(config, :database, "./data.db")
+
+    {:ok, Keyword.put(config, :database, database)}
   end
 end
diff --git a/test/items_api/repo_test.exs b/test/items_api/repo_test.exs
new file mode 100644
index 0000000..0d6eab3
--- /dev/null
+++ b/test/items_api/repo_test.exs
@@ -0,0 +1,23 @@
+defmodule ItemsApi.RepoTest do
+  use ExUnit.Case, async: false
+
+  setup do
+    :ok = Ecto.Adapters.SQL.Sandbox.checkout(ItemsApi.Repo)
+    :ok
+  end
+
+  describe "Repo" do
+    test "is running and accepting queries" do
+      assert {:ok, %{rows: [[1]]}} = Ecto.Adapters.SQL.query(ItemsApi.Repo, "SELECT 1")
+    end
+
+    test "uses SQLite3 adapter" do
+      assert ItemsApi.Repo.__adapter__() == Ecto.Adapters.SQLite3
+    end
+
+    test "has otp_app set to :items_api" do
+      config = ItemsApi.Repo.config()
+      assert config[:otp_app] == :items_api
+    end
+  end
+end