diff --git a/.env-example b/.env-example
new file mode 100644
index 0000000..4bcfcf1
--- /dev/null
+++ b/.env-example
@@ -0,0 +1,4 @@
+USE_LOCAL_CACHE_STORAGE_BACKEND=1
+PYTHON_VERSION=3.9.18
+OS_VARIANT=slim-bookworm
+POETRY_VERSION=1.6.1
diff --git a/build/publish.py b/build/publish.py
index 9dea9fe..5d07b3b 100644
--- a/build/publish.py
+++ b/build/publish.py
@@ -1,6 +1,6 @@
 import click
 
-from build.utils import get_context
+from build.utils import get_context, get_image_reference
 from pathlib import Path
 from python_on_whales import DockerClient, Builder
 
@@ -58,7 +58,9 @@ def main(
 ) -> None:
     context: Path = get_context()
 
-    tag: str = f"{registry}/pfeiffermax/python-poetry:{version_tag}-poetry{poetry_version}-python{python_version}-{os_variant}"
+    image_reference: str = get_image_reference(
+        registry, version_tag, poetry_version, python_version, os_variant
+    )
 
     platforms: list[str] = ["linux/amd64", "linux/arm64/v8"]
     cache_to: str = "type=gha,mode=max"
@@ -86,7 +88,7 @@ def main(
             "POETRY_VERSION": poetry_version,
             "OFFICIAL_PYTHON_IMAGE": f"python:{python_version}-{os_variant}",
         },
-        tags=tag,
+        tags=image_reference,
         platforms=platforms,
         builder=builder,
         cache_to=cache_to,
diff --git a/build/utils.py b/build/utils.py
index d4dddc8..d5e5b96 100644
--- a/build/utils.py
+++ b/build/utils.py
@@ -5,6 +5,12 @@ def get_context() -> Path:
     return Path(__file__).parent.resolve()
 
 
-def get_docker_bake_file() -> Path:
-    docker_bake_file: Path = Path(__file__).parent.resolve() / "docker-bake.hcl"
-    return docker_bake_file
+def get_image_reference(
+    registry: str,
+    image_version: str,
+    poetry_version: str,
+    python_version: str,
+    os_variant: str,
+) -> str:
+    reference: str = f"{registry}/pfeiffermax/python-poetry:{image_version}-poetry{poetry_version}-python{python_version}-{os_variant}"
+    return reference
diff --git a/tests/build_image/conftest.py b/tests/build_image/conftest.py
index 46e1ee8..5fe723b 100644
--- a/tests/build_image/conftest.py
+++ b/tests/build_image/conftest.py
@@ -1,6 +1,7 @@
 from time import sleep
 import pytest
 from python_on_whales import Builder, DockerClient
+from build.utils import get_image_reference
 
 from tests.constants import (
     CONTEXT,
@@ -43,7 +44,9 @@ def image_reference(
     os_variant: str = getenv("OS_VARIANT")
     poetry_version: str = getenv("POETRY_VERSION")
 
-    tag: str = f"{registry}/pfeiffermax/python-poetry:{image_version}-poetry{poetry_version}-python{python_version}-{os_variant}"
+    image_reference: str = get_image_reference(
+        registry, image_version, poetry_version, python_version, os_variant
+    )
     cache_scope: str = (
         f"{image_version}-{poetry_version}-{python_version}-{os_variant}"
     )
@@ -63,11 +66,11 @@ def image_reference(
             "POETRY_VERSION": poetry_version,
             "OFFICIAL_PYTHON_IMAGE": f"python:{python_version}-{os_variant}",
         },
-        tags=tag,
+        tags=image_reference,
         platforms=platforms,
         builder=pow_buildx_builder,
         cache_to=cache_to,
         cache_from=cache_from,
         push=True,
     )
-    yield tag
+    yield image_reference
diff --git a/tests/constants.py b/tests/constants.py
index 8744ec5..4cf32e5 100644
--- a/tests/constants.py
+++ b/tests/constants.py
@@ -1,9 +1,8 @@
 from pathlib import Path
 
-from build.utils import get_context, get_docker_bake_file
+from build.utils import get_context
 
 SLEEP_TIME: float = 3.0
 REGISTRY_USERNAME: str = "foo"
 REGISTRY_PASSWORD: str = "bar"
-BAKE_FILE: Path = get_docker_bake_file()
 CONTEXT: Path = get_context()