feature/multi-cloud (#14)

Co-authored-by: Danijel Simeunovic <danijel.simeunovic@fortedigital.com>
Reviewed-on: #14

scripts/backup/azure-blob.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+set -euo pipefail
+# Azure Blob Storage backup upload
+# Uses: az cli
+# Env: AZURE_STORAGE_ACCOUNT, AZURE_STORAGE_KEY, AZURE_CONTAINER
+
+BACKUP_FILE="${1:?Usage: $0 <backup-file>}"
+TIMESTAMP=$(date +%Y%m%d-%H%M%S)
+KEY="gitea-dump-${TIMESTAMP}.zip"
+
+echo "Uploading ${KEY}..."
+az storage blob upload \
+  --account-name "${AZURE_STORAGE_ACCOUNT}" \
+  --account-key "${AZURE_STORAGE_KEY}" \
+  --container-name "${AZURE_CONTAINER}" \
+  --name "${KEY}" \
+  --file "$BACKUP_FILE" \
+  --overwrite
+echo "Upload complete."
+
+# Prune backups older than 7 days
+echo "Pruning backups older than 7 days..."
+CUTOFF=$(date -d '7 days ago' +%Y-%m-%dT%H:%M:%SZ 2>/dev/null || date -v-7d +%Y-%m-%dT%H:%M:%SZ)
+az storage blob list \
+  --account-name "${AZURE_STORAGE_ACCOUNT}" \
+  --account-key "${AZURE_STORAGE_KEY}" \
+  --container-name "${AZURE_CONTAINER}" \
+  --query "[?properties.lastModified<'${CUTOFF}'].name" -o tsv \
+  | while read -r name; do
+      [ -n "$name" ] && az storage blob delete \
+        --account-name "${AZURE_STORAGE_ACCOUNT}" \
+        --account-key "${AZURE_STORAGE_KEY}" \
+        --container-name "${AZURE_CONTAINER}" \
+        --name "$name" && echo "Deleted: ${name}"
+    done
+echo "Pruning complete."