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

@@ -1,6 +1,4 @@
-# syntax=docker/dockerfile:1
-
-FROM python:3.12-alpine
+FROM python:3.12-alpine AS base
 
 # VENV not needed in docker container
 ENV POETRY_VIRTUALENVS_CREATE=false 
@@ -13,6 +11,9 @@ COPY . .
 RUN pip install poetry
 RUN poetry install
 
+
+FROM base as dev
+
 # Expose development port
 EXPOSE 5000