fix: pin python version + fix font path

docker/dev/Dockerfile

@@ -1,5 +1,5 @@
-# use latest python 3 alpine image.
-FROM python:3-alpine
+# use latest python alpine image.
+FROM python:3.12.6-alpine3.20
 
 # install system dependencies.
 RUN apk update && apk add --no-cache \
@@ -9,7 +9,7 @@ RUN apk update && apk add --no-cache \
 RUN go install github.com/mingrammer/round@latest
 
 # install fonts
-RUN curl -O https://noto-website.storage.googleapis.com/pkgs/NotoSansCJKjp-hinted.zip \
+RUN curl -O https://noto-website-2.storage.googleapis.com/pkgs/NotoSansCJKjp-hinted.zip \
 && mkdir -p /usr/share/fonts/NotoSansCJKjp \
 && unzip NotoSansCJKjp-hinted.zip -d /usr/share/fonts/NotoSansCJKjp/ \
 && rm NotoSansCJKjp-hinted.zip \
@@ -25,4 +25,4 @@ WORKDIR /usr/src/diagrams
 COPY . .
 
 # install python requirements.
-RUN pip install black graphviz jinja2
+RUN pip install black graphviz jinja2