ci: use TUNA Fedora mirror

.gitea/workflows/build-windows-release.yml

@@ -22,8 +22,21 @@ jobs:
       PACKAGE_BASENAME: chengnan-windows-x64-mingw
 
     steps:
+      - name: Configure Fedora TUNA mirror
+        run: |
+          set -euo pipefail
+          sed -e 's|^metalink=|#metalink=|g' \
+              -e 's|^#baseurl=http://download.example/pub/fedora/linux|baseurl=https://mirrors.tuna.tsinghua.edu.cn/fedora|g' \
+              -i /etc/yum.repos.d/fedora*.repo
+          if [ -f /etc/yum.repos.d/fedora-cisco-openh264.repo ]; then
+            sed -i 's|^enabled=1|enabled=0|g' /etc/yum.repos.d/fedora-cisco-openh264.repo
+          fi
+          dnf clean all
+          dnf makecache --refresh -y
+
       - name: Install cross build dependencies
         run: |
+          set -euo pipefail
           dnf install -y \
             git \
             curl \