merge layer , slim the size

Dockerfile

@@ -1,25 +1,26 @@
 FROM ubuntu:20.04
 LABEL maintainer="[email protected]"
-RUN sed -i "s/archive.ubuntu.com/mirrors.aliyun.com/g" /etc/apt/sources.list
-RUN apt-get update
-RUN apt-get install -y --no-install-recommends \
-    openjdk-11-jre \
-    ca-certificates \
-    procps \
-    wget \
-    fontconfig \
-    software-properties-common
-
-RUN add-apt-repository ppa:libreoffice/libreoffice-7-0 && apt update && apt install -y libreoffice --no-install-recommends
-
+# RUN sed -i "s/archive.ubuntu.com/mirrors.aliyun.com/g" /etc/apt/sources.list
+RUN apt update && \
+    apt install -y --no-install-recommends \
+        openjdk-11-jre \
+        ca-certificates \
+        procps \
+        wget \
+        fontconfig \
+        software-properties-common && \
+    add-apt-repository ppa:libreoffice/libreoffice-7-0 && \
+    apt update && \
+    apt install -y libreoffice --no-install-recommends && \
+    apt autopurge && \
+    rm -rf /var/lib/apt/lists/*
 # Install fonts
 RUN wget https://github.com/adobe-fonts/source-han-mono/releases/download/1.002/SourceHanMono.ttc \
-    -O  SourceHanMono.ttc
-RUN wget https://github.com/adobe-fonts/source-han-serif/releases/download/1.001R/SourceHanSerif.ttc \
-    -O SourceHanSerif.ttc
-RUN wget https://github.com/adobe-fonts/source-han-sans/releases/download/2.002R/SourceHanSans.ttc \
-    -O SourceHanSans.ttc
-RUN mv ./SourceHan*.ttc /usr/share/fonts/
+        -O  /usr/share/fonts/SourceHanMono.ttc && \
+    wget https://github.com/adobe-fonts/source-han-serif/releases/download/1.001R/SourceHanSerif.ttc \
+        -O /usr/share/fonts/SourceHanSerif.ttc && \
+    wget https://github.com/adobe-fonts/source-han-sans/releases/download/2.002R/SourceHanSans.ttc \
+        -O /usr/share/fonts/SourceHanSans.ttc
 
 COPY ./fonts/norm/* /usr/share/fonts/
 COPY ./fonts/other/* /usr/share/fonts/