fix: export AWS credentials so aws cli can locate them

The config file sets AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY as
shell variables, but aws cli needs them as environment variables.
Added explicit export statements in both bc-backup.sh and bc-cleanup.sh.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

bc-backup.sh

@@ -107,6 +107,11 @@ S3_TOOL="${S3_TOOL:-awscli}"
 MAX_RETRIES="${MAX_RETRIES:-3}"
 CLEANUP_LOCAL="${CLEANUP_LOCAL:-true}"
 
+# Export AWS credentials so aws cli can find them
+export AWS_ACCESS_KEY_ID
+export AWS_SECRET_ACCESS_KEY
+export AWS_DEFAULT_REGION="${AWS_DEFAULT_REGION:-us-east-1}"
+
 # Determine SinceDateTime for incremental mode
 SINCE_DATETIME=""
 if [[ "${BACKUP_MODE}" == "incremental" ]]; then

bc-cleanup.sh

@@ -39,6 +39,11 @@ done
 
 RETENTION_DAYS="${RETENTION_DAYS:-30}"
 
+# Export AWS credentials so aws cli can find them
+export AWS_ACCESS_KEY_ID
+export AWS_SECRET_ACCESS_KEY
+export AWS_DEFAULT_REGION="${AWS_DEFAULT_REGION:-us-east-1}"
+
 # Calculate cutoff date
 if [[ "$OSTYPE" == "darwin"* ]]; then
     CUTOFF_DATE=$(date -u -v-${RETENTION_DAYS}d '+%Y-%m-%dT%H:%M:%SZ')