build(docker): 💚 add custom entrypoint script to our CI image

This should be also suitable for local development via Docker too.

Signed-off-by: Andrei Jiroh Halili <ajhalili2006@gmail.com>

docker/Dockerfile

@@ -1,14 +1,20 @@
 FROM squidfunk/mkdocs-material
 
 # https://squidfunk.github.io/mkdocs-material/setup/setting-up-social-cards/#linux but for Alpine
-RUN apk add \
+RUN apk add --no-cache \
      cairo-dev \
      freetype-dev \
      libffi-dev \
      jpeg-dev \
      libpng-dev \
-     zlib-dev
+     zlib-dev \
+     bash \
+     coreutils
 RUN pip3 install \
       mkdocs-git-revision-date-localized-plugin \
       pillow \
-      cairosvg
+      cairosvg
+
+COPY entrypoint.sh /usr/local/bin/entrypoint.sh
+ENTRYPOINT [ "/usr/local/bin/entrypoint.sh" ]
+CMD [ "serve" ]