Small improvement in generate-fonts.py following code review.

Add lv_img_conf in Docker image to build resources at build time.

docker/Dockerfile

@@ -22,6 +22,12 @@ RUN apt-get update -qq \
       python3-dev \
       git \
       apt-utils \
+      pkg-config \
+      libpixman-1-dev \
+      libcairo2-dev \
+      libpango-1.0-0 \
+      ibpango1.0-dev \
+      libpangocairo-1.0-0 \
     && curl -sL https://deb.nodesource.com/setup_18.x | bash - \
     && apt-get install -y nodejs \
     && rm -rf /var/cache/apt/* /var/lib/apt/lists/*;
@@ -33,6 +39,10 @@ RUN pip3 install -Iv cryptography==3.3
 RUN pip3 install cbor
 RUN npm i lv_font_conv@1.5.2 -g
 
+RUN npm i ts-node@10.9.1 -g
+RUN npm i @swc/core -g
+RUN npm i lv_img_conv@0.3.0 -g
+
 # build.sh knows how to compile
 COPY build.sh /opt/