Add a retry to gdal http requests during CI.

tox.ini

@@ -18,6 +18,8 @@ extras =
 setenv =
   PIP_FIND_LINKS=https://girder.github.io/large_image_wheels
   GDAL_PAM_ENABLED=no
+  GDAL_HTTP_MAX_RETRY=5
+  GDAL_HTTP_RETRY_DELAY=5
 
 [testenv:test]
 description = Run all tests, including Girder
@@ -52,6 +54,8 @@ setenv =
   NPM_CONFIG_PREFER_OFFLINE=true
   PIP_FIND_LINKS=https://girder.github.io/large_image_wheels
   GDAL_PAM_ENABLED=no
+  GDAL_HTTP_MAX_RETRY=5
+  GDAL_HTTP_RETRY_DELAY=5
 
 # Versions that do have all tile sources.  Using the requirements-dev.txt file
 # installs in editable mode, which then includes results in coverage.
@@ -105,6 +109,8 @@ setenv =
   NPM_CONFIG_PREFER_OFFLINE=true
   PIP_FIND_LINKS=https://girder.github.io/large_image_wheels
   GDAL_PAM_ENABLED=no
+  GDAL_HTTP_MAX_RETRY=5
+  GDAL_HTTP_RETRY_DELAY=5
 
 [testenv:server]
 description = Run all tests except Girder client
@@ -161,6 +167,8 @@ commands =
 setenv =
   PIP_FIND_LINKS=https://girder.github.io/large_image_wheels
   GDAL_PAM_ENABLED=no
+  GDAL_HTTP_MAX_RETRY=5
+  GDAL_HTTP_RETRY_DELAY=5
   JUPYTER_PLATFORM_DIRS=1
 
 [testenv:lint]
@@ -321,6 +329,8 @@ passenv = PIP_FIND_LINKS
 setenv =
   PIP_FIND_LINKS={env:PIP_FIND_LINKS:https://girder.github.io/large_image_wheels}
   GDAL_PAM_ENABLED=no
+  GDAL_HTTP_MAX_RETRY=5
+  GDAL_HTTP_RETRY_DELAY=5
 deps =
   -rrequirements-test-core.txt
   pooch