fix: run migrations before unit tests in CI

Some unit tests (test_api_deps, test_server_key) are integration tests
that need DB tables. Move alembic upgrade head before unit tests.

tests/test_server_key.py

@@ -0,0 +1,63 @@
+"""Tests for server public key retrieval from Configuration table."""
+
+import pytest
+
+from wiregui.db import async_session
+from wiregui.models.configuration import Configuration
+from wiregui.utils.server_key import get_server_public_key
+from sqlmodel import select
+
+
+@pytest.fixture(autouse=True)
+async def _snapshot_config():
+    """Snapshot and restore server_public_key around each test."""
+    async with async_session() as session:
+        c = (await session.execute(select(Configuration).limit(1))).scalar_one_or_none()
+        orig = c.server_public_key if c else None
+        cid = c.id if c else None
+
+    yield
+
+    if cid:
+        async with async_session() as session:
+            c = await session.get(Configuration, cid)
+            if c:
+                c.server_public_key = orig
+                session.add(c)
+                await session.commit()
+
+
+async def test_get_server_public_key_returns_key():
+    """Returns the public key when configured."""
+    async with async_session() as session:
+        c = (await session.execute(select(Configuration).limit(1))).scalar_one_or_none()
+        c.server_public_key = "TestServerPubKey123456789012345678901234w="
+        session.add(c)
+        await session.commit()
+
+    result = await get_server_public_key()
+    assert result == "TestServerPubKey123456789012345678901234w="
+
+
+async def test_get_server_public_key_raises_when_missing():
+    """Raises RuntimeError when server_public_key is None."""
+    async with async_session() as session:
+        c = (await session.execute(select(Configuration).limit(1))).scalar_one_or_none()
+        c.server_public_key = None
+        session.add(c)
+        await session.commit()
+
+    with pytest.raises(RuntimeError, match="not configured"):
+        await get_server_public_key()
+
+
+async def test_get_server_public_key_raises_when_empty_string():
+    """Raises RuntimeError when server_public_key is empty string."""
+    async with async_session() as session:
+        c = (await session.execute(select(Configuration).limit(1))).scalar_one_or_none()
+        c.server_public_key = ""
+        session.add(c)
+        await session.commit()
+
+    with pytest.raises(RuntimeError, match="not configured"):
+        await get_server_public_key()