CI: Use apt config file to disable AppStream metadata downloads

Command-line flags (-o Acquire::IndexTargets::deb::DEP-11::DefaultEnabled)
were not taking effect, causing continued dep11 download failures during
mirror synchronization.

Solution: Create /etc/apt/apt.conf.d/99-no-appstream configuration file
before running apt update. This is more reliable than command-line options
as apt always reads config files from /etc/apt/apt.conf.d/ directory.

Author: jserv

.github/workflows/main.yml

@@ -69,13 +69,12 @@ jobs:
 
     - name: Install dependencies
       run: |
-            # Retry apt-get update to handle transient mirror sync issues
-            for i in 1 2 3; do
-              sudo apt-get update -q=2 -o Acquire::Retries=3 && break || {
-                echo "apt-get update attempt $i failed, retrying..."
-                sleep 5
-              }
-            done
+            # Create apt config to disable AppStream metadata (causes mirror sync failures)
+            sudo mkdir -p /etc/apt/apt.conf.d
+            echo 'Acquire::IndexTargets::deb::DEP-11 "false";' | sudo tee /etc/apt/apt.conf.d/99-no-appstream
+            echo 'Acquire::IndexTargets::deb::DEP-11-icons "false";' | sudo tee -a /etc/apt/apt.conf.d/99-no-appstream
+            echo 'Acquire::IndexTargets::deb::DEP-11-icons-hidpi "false";' | sudo tee -a /etc/apt/apt.conf.d/99-no-appstream
+            sudo apt-get update -q=2 -o Acquire::Retries=3
             sudo apt-get install -q=2 -o Acquire::Retries=3 curl libsdl2-dev libsdl2-mixer-dev device-tree-compiler expect bc p7zip-full
       shell: bash
 
@@ -307,13 +306,12 @@ jobs:
         githubToken: ${{ github.token }}
         # No 'sudo' is available
         install: |
-          # Retry apt update to handle transient mirror sync issues
-          for i in 1 2 3; do
-            apt update -qq -o Acquire::Retries=3 && break || {
-              echo "apt update attempt $i failed, retrying..."
-              sleep 5
-            }
-          done
+          # Create apt config to disable AppStream metadata (causes mirror sync failures)
+          mkdir -p /etc/apt/apt.conf.d
+          echo 'Acquire::IndexTargets::deb::DEP-11 "false";' > /etc/apt/apt.conf.d/99-no-appstream
+          echo 'Acquire::IndexTargets::deb::DEP-11-icons "false";' >> /etc/apt/apt.conf.d/99-no-appstream
+          echo 'Acquire::IndexTargets::deb::DEP-11-icons-hidpi "false";' >> /etc/apt/apt.conf.d/99-no-appstream
+          apt update -qq -o Acquire::Retries=3 || true
           apt install -yqq -o Acquire::Retries=3 make git curl wget clang libsdl2-dev libsdl2-mixer-dev lsb-release software-properties-common gnupg bc
           which wget || echo "WARNING: wget not found after installation"
         # FIXME: gcc build fails on Aarch64/Linux hosts
@@ -323,9 +321,8 @@ jobs:
         run: |
           # Verify and install wget if needed (workaround for install step issues)
           if ! command -v wget > /dev/null 2>&1; then
-            for i in 1 2 3; do
-              apt update -qq -o Acquire::Retries=3 && break || sleep 5
-            done
+            # AppStream config should already exist from install step
+            apt update -qq -o Acquire::Retries=3 || true
             apt install -yqq -o Acquire::Retries=3 wget
           fi
           git config --global --add safe.directory ${{ github.workspace }}
@@ -585,13 +582,12 @@ jobs:
     # LLVM static analysis
     - name: set up scan-build
       run: |
-            # Retry apt-get update to handle transient mirror sync issues
-            for i in 1 2 3; do
-              sudo apt-get update -q=2 -o Acquire::Retries=3 && break || {
-                echo "apt-get update attempt $i failed, retrying..."
-                sleep 5
-              }
-            done
+            # Create apt config to disable AppStream metadata (causes mirror sync failures)
+            sudo mkdir -p /etc/apt/apt.conf.d
+            echo 'Acquire::IndexTargets::deb::DEP-11 "false";' | sudo tee /etc/apt/apt.conf.d/99-no-appstream
+            echo 'Acquire::IndexTargets::deb::DEP-11-icons "false";' | sudo tee -a /etc/apt/apt.conf.d/99-no-appstream
+            echo 'Acquire::IndexTargets::deb::DEP-11-icons-hidpi "false";' | sudo tee -a /etc/apt/apt.conf.d/99-no-appstream
+            sudo apt-get update -q=2 -o Acquire::Retries=3
             sudo apt-get install -q=2 -o Acquire::Retries=3 curl libsdl2-dev libsdl2-mixer-dev
             .ci/fetch.sh -q -o llvm.sh https://apt.llvm.org/llvm.sh
             chmod +x ./llvm.sh