refactor(Dockerfile): use alpine base image (#79)

Co-authored-by: very-doge-wow <very-doge-wow@github.com>

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.12.2-slim
+FROM python:3.12-alpine3.19
 
 USER root
 
@@ -7,11 +7,14 @@ WORKDIR app
 COPY reader ./reader/
 COPY writer ./writer/
 COPY stella.py Pipfile Pipfile.lock ./
+COPY EXAMPLE/style.css .
 
-RUN pip install pipenv && \
-    pipenv install --system --deploy && \
-    chmod +x stella.py && \
-    ln -s /app/stella.py /usr/local/bin/stella
+RUN <<EOF
+pip install pipenv
+pipenv install --system --deploy
+chmod +x stella.py
+ln -s /app/stella.py /usr/local/bin/stella
+EOF
 
 USER 1000