Clean up unused test fluff from docker

Dockerfile

@@ -1,36 +1,17 @@
-FROM python:3.12 as builder
+FROM python:3.12 as service
 
 RUN pip install poetry==1.6.1
 
 ENV POETRY_NO_INTERACTION=1 \
     POETRY_VIRTUALENVS_IN_PROJECT=1 \
-    POETRY_VIRTUALENVS_CREATE=1 \
-    POETRY_CACHE_DIR=/tmp/poetry_cache
+    POETRY_VIRTUALENVS_CREATE=1
 
 WORKDIR /app
 
 COPY pyproject.toml poetry.lock ./
-RUN touch README.md
-
-RUN --mount=type=cache,target=$POETRY_CACHE_DIR poetry install --with dev --no-root
-
-FROM python:3.12 as test_runner
-
-ENV VIRTUAL_ENV=/app/.venv \
-    PATH="/app/.venv/bin:$PATH"
-
-COPY --from=builder ${VIRTUAL_ENV} ${VIRTUAL_ENV}
-COPY src ./tests
-COPY tests ./tests
-
-WORKDIR tests
 
-# run tests
-RUN poetry run pytest .
-
-FROM python:3.12 as service
+RUN poetry install --without dev --no-root
 
 ENV VIRTUAL_ENV=/app/.venv \
     PATH="/app/.venv/bin:$PATH"
-COPY --from=builder ${VIRTUAL_ENV} ${VIRTUAL_ENV}
 COPY src .