feat(k8s/archmirror): add Arch Linux mirror stack

kubernetes/app/archmirror/configmap-sync.yaml

@@ -0,0 +1,42 @@
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: archmirror-sync-script
+  namespace: archmirror
+data:
+  sync.sh: |
+    #!/bin/sh
+    set -e
+
+    TARGET_DIR="/archlinux"
+    MAX_RETRIES=3
+
+    log() {
+        echo "[$(date '+%Y-%m-%d %H:%M:%S')] $1" >&2
+    }
+
+    if [ -z "$MIRROR_URL" ]; then
+        log "ERROR: MIRROR_URL not set"
+        exit 1
+    fi
+
+    mkdir -p "$TARGET_DIR"
+    for i in $(seq 1 $MAX_RETRIES); do
+        log "Sync attempt $i/$MAX_RETRIES from $MIRROR_URL"
+
+        if rsync --timeout=7200 \
+                 -rlptH --safe-links --delete-delay --delay-updates \
+                 -v --info=progress2 \
+                 "$MIRROR_URL/" "$TARGET_DIR/"; then
+            log "Sync completed successfully"
+            exit 0
+        fi
+
+        if [ "$i" -lt "$MAX_RETRIES" ]; then
+            sleep $((i * 300))
+        fi
+    done
+
+    log "All sync attempts failed"
+    exit 1