Skip GDAL VRT driver to mitigate security issue

Skip VRT driver to prevent arbitrary file reading vulnerability
reported in GDAL issue OSGeo/gdal#12645
and developmentseed/titiler#1180.
This configuration prevents exploitation of GDAL's VRT driver
which can be used to read arbitrary files from the filesystem.

Author: sunu

helm-chart/eoapi/values.yaml

@@ -247,6 +247,7 @@ raster:
       GDAL_HTTP_MERGE_CONSECUTIVE_RANGES: "YES"
       GDAL_HTTP_MULTIPLEX: "YES"
       GDAL_HTTP_VERSION: "2"
+      GDAL_SKIP: "VRT" # skip VRT driver to avoid https://github.com/OSGeo/gdal/issues/12645
       PYTHONWARNINGS: "ignore"
       VSI_CACHE: "TRUE"
       VSI_CACHE_SIZE: "5000000"  # 5 MB (per file-handle)