refactor: Renaming Dockerfile and changing structure

Refs: OPS-10
The Dockerfile is renamed to the canonical name and not contains
multiple stages to eventually support dev and pod builds

Dockerfile

@@ -0,0 +1,23 @@
+FROM python:3.12-alpine AS base
+
+# VENV not needed in docker container
+ENV POETRY_VIRTUALENVS_CREATE=false 
+
+WORKDIR /app
+
+COPY . . 
+
+# Install dependencies
+RUN pip install poetry
+RUN poetry install
+
+
+FROM base as dev
+
+# Expose development port
+EXPOSE 5000
+
+# Include host flag to make flask listen on all interfaces
+# Otherwise it is not accessible from the outside.
+CMD [ "flask", "--app", "senju/main", "run", "--debug", "--host=0.0.0.0"]
+