fix(retention): add retry on Gitea API errors

- Retry up to 3 times (2 retries) on non-200/non-404 responses
- 10 second delay between retries
- Fail-safe: keep report if all retries fail

git-pages/files/retention-cleanup.sh

@@ -16,7 +16,7 @@ curl_with_host() {
 declare -A BRANCH_CACHE
 branch_exists() {
   local owner="$1" repo="$2" branch="$3" key="${owner}/${repo}/${branch}"
-  local status
+  local status attempt
   
   [ -z "$GITEA_API_URL" ] && return 0
   [ -z "$GITEA_TOKEN" ] && return 0
@@ -25,6 +25,8 @@ branch_exists() {
     return 0
   fi
   
+  # Retry up to 2 times on API errors (hardcoded)
+  for attempt in 1 2 3; do
     status=$(curl -sS -o /dev/null -w "%{http_code}" \
       -H "Authorization: token ${GITEA_TOKEN}" \
       "${GITEA_API_URL}/api/v1/repos/${owner}/${repo}/branches/${branch}" 2>/dev/null || echo "000")
@@ -34,15 +36,21 @@ branch_exists() {
       return 0
     fi
     
-  # API error or branch not found - log warning and keep report (fail-safe)
-  if [ "$status" != "404" ]; then
-    echo "  WARN: Gitea API error for ${owner}/${repo}/${branch} (status ${status}) - KEEPING report"
-    BRANCH_CACHE[$key]=1  # cache as "exists" to avoid repeated errors
-    return 0
+    if [ "$status" = "404" ]; then
+      return 1
     fi
     
-  # Actual 404 - branch truly doesn't exist
-  return 1
+    # API error - retry if not last attempt
+    if [ "$attempt" -lt 3 ]; then
+      sleep 10
+      continue
+    fi
+  done
+  
+  # All retries failed - keep report (fail-safe)
+  echo "  WARN: Gitea API error for ${owner}/${repo}/${branch} (status ${status}) after 3 attempts - KEEPING report"
+  BRANCH_CACHE[$key]=1
+  return 0
 }
 
 default_max_age=$(jq -r '.branches.default.maxAgeDays // 90' "$CONFIG")