CI: Work around Azure Ubuntu mirror issue

.github/workflows/rolling-release.yml

@@ -171,8 +171,9 @@ jobs:
     - name: Install packages
       shell: bash
       run: |
-        sudo apt-get update
+        # Workaround for https://github.com/actions/runner-images/issues/675
-        sudo apt-get -y install cmake ninja-build ccache libsdl2-dev libgtk-3-dev libegl1-mesa-dev libevdev-dev libgbm-dev libdrm-dev libwayland-dev libwayland-egl-backend-dev extra-cmake-modules libcurl4-gnutls-dev libxrandr-dev llvm-12 lld-12 clang-12
+        sudo scripts/retry.sh apt-get update
+        sudo scripts/retry.sh apt-get -y install cmake ninja-build ccache libsdl2-dev libgtk-3-dev libegl1-mesa-dev libevdev-dev libgbm-dev libdrm-dev libwayland-dev libwayland-egl-backend-dev extra-cmake-modules libcurl4-gnutls-dev libxrandr-dev llvm-12 lld-12 clang-12
 
     - name: Cache Dependencies
       id: cache-deps

scripts/retry.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+RETRIES=10
+
+for i in $(seq 1 "$RETRIES"); do
+	"$@" && break
+	if [ "$i" == "$RETRIES" ]; then
+		echo "Command \"$@\" failed after ${RETRIES} retries."
+		exit 1
+	fi
+done
+
+exit 0