feat: always use https mirrors for layering

config/common/common-scripts.yml

@@ -5,3 +5,4 @@ scripts:
   - disablesealertpopups.sh
   - homebrewanalyticsoptout.sh
   - hardencontainerpolicy.sh
+  - httpsmirrors.sh

config/scripts/httpsmirrors.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+# Tell build process to exit if there are any errors.
+set -oue pipefail
+
+for repo in /usr/etc/yum.repos.d/*.repo; do
+    sed -i 's/metalink?/metalink?protocol=https\&/g' "$repo"
+done