build: Use xml2rfc-fonts (#375) (#478)

Dockerfile

@@ -41,16 +41,12 @@ RUN apt-get update && \
     apt-get clean -y
 
 # Install required fonts
-RUN mkdir -p ~/.fonts/opentype && \
-    wget -q https://noto-website-2.storage.googleapis.com/pkgs/Noto-unhinted.zip && \
-    unzip -q Noto-unhinted.zip -d ~/.fonts/opentype/ && \
-    rm Noto-unhinted.zip && \
-    wget -q https://fonts.google.com/download?family=Roboto%20Mono -O roboto-mono.zip && \
-    unzip -q roboto-mono.zip -d ~/.fonts/opentype/ && \
-    rm roboto-mono.zip && \
-    wget -q https://fonts.google.com/download?family=Noto+Sans+Math -O noto-sans-math.zip && \
-    unzip -q noto-sans-math.zip -d ~/.fonts/opentype/ && \
-    rm noto-sans-math.zip
+RUN mkdir -p ~/.fonts/opentype /tmp/fonts && \
+    wget -q -O /tmp/fonts.tar.gz https://github.com/ietf-tools/xml2rfc-fonts/archive/refs/tags/3.20.0.tar.gz && \
+    tar zxf /tmp/fonts.tar.gz -C /tmp/fonts && \
+    mv /tmp/fonts/*/noto/* ~/.fonts/opentype/ && \
+    mv /tmp/fonts/*/roboto_mono/* ~/.fonts/opentype/ && \
+    rm -rf /tmp/fonts.tar.gz /tmp/fonts/
 
 # Install bap
 RUN wget https://github.com/ietf-tools/bap/archive/refs/heads/master.zip && \