Replace centos with rocky

CentOS no longer updates its image on Docker Hub, and it is nearly at the end of its life.

.github/workflows/build.yml

@@ -17,7 +17,7 @@ jobs:
       matrix:
         include:
           - IMAGE_NAME: alpine
-          - IMAGE_NAME: centos
+          - IMAGE_NAME: rocky
           - IMAGE_NAME: debian
           - IMAGE_NAME: fedora
           - IMAGE_NAME: ubuntu

README.md

@@ -4,7 +4,7 @@ The fast way to use USTC mirrors in your container.
 
 ## Available distros
 
-`ustclug/ubuntu`, `ustclug/debian`, `ustclug/fedora`, `ustclug/centos`, `ustclug/alpine`.
+`ustclug/ubuntu`, `ustclug/debian`, `ustclug/fedora`, ~~`ustclug/centos`~~, `ustclug/rocky`, `ustclug/alpine`.
 
 ## Example
 

build-rocky.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+source common.sh
+docker-tags rockylinux |
+while read tag; do
+    dockerfile=$(mktemp)
+    cat << EOF > $dockerfile
+FROM rockylinux:$tag
+RUN sed -i \
+    -e 's/mirrorlist/#mirrorlist/g' \
+    -e 's/#baseurl/baseurl/g' \
+    -e 's|dl.rockylinux.org/\$contentdir|mirrors.ustc.edu.cn/rocky|g' \
+    /etc/yum.repos.d/Rocky-*.repo || \
+    sed -i \
+    -e 's/mirrorlist/#mirrorlist/g' \
+    -e 's/#baseurl/baseurl/g' \
+    -e 's|dl.rockylinux.org/\$contentdir|mirrors.ustc.edu.cn/rocky|g' \
+    /etc/yum.repos.d/rocky*.repo
+EOF
+    docker build -f $dockerfile -t ustclug/rocky:$tag .
+    docker push ustclug/rocky:$tag
+    rm $dockerfile
+done