Moved Dockerfile for gitpod.

.docker/gitpod/Dockerfile

@@ -6,15 +6,20 @@ FROM ubuntu:jammy
 
 USER root
 
-# apk add make font-noto-cjk ttf-freefont
-RUN apt-get update && apt-get install make perl font-noto-cjk ttf-freefont sudo git curl git bash-completion -y && apt-get clean
+RUN apt-get update && \
+    apt-get install -y \
+        make perl \
+        fonts-noto-cjk fonts-freefont-ttf \
+        sudo git curl bash-completion && \
+    apt-get clean && \
+    rm -rf /var/cache/apt/* && rm -rf /var/lib/apt/lists/* && rm -rf /tmp/*
+
+# install texlive, reference from: https://www.tug.org/texlive/quickinstall.html
 
-# install tex-live
-# reference from: https://www.tug.org/texlive/quickinstall.html
 RUN wget https://mirror.ctan.org/systems/texlive/tlnet/install-tl-unx.tar.gz
-RUN zcat < install-tl-unx.tar.gz | tar xf -
-RUN cd install-tl-*
-RUN perl ./install-tl --no-interaction # as root or with writable destination
+RUN zcat < install-tl-unx.tar.gz | tar xf - && \
+    cd install-tl-* && \
+    perl ./install-tl --no-interaction # as root or with writable destination
 
 RUN useradd -l -u 33333 -G sudo -md /home/gitpod -s /bin/bash -p gitpod gitpod \
     # passwordless sudo for users in the 'sudo' group