fix image test extension #2200

Job	Run time
Build and test docker images	7m 2s
Build aarch64-apple-darwin	3m 34s
Build debian-x86_64	10m 44s
Build x86_64-apple-darwin	4m 38s
Lint and Unit test	4m 32s
Build x86_64-pc-windows-msvc	6m 7s
Build x86_64-unknown-linux-gnu	2m 1s
Test on macOS-latest	6m 21s
Test postgis:11-3.0-alpine sslmode=disable	6m 19s
Test on windows-latest	1m 31s
Test postgis:14-3.3-alpine sslmode=disable	5m 45s
Test on ubuntu-latest	50s
Test postgis:15-3.3 sslmode=require	6m 27s
Package	59s
CI Finished	1s
	1h 6m 51s

Provide feedback