Add support for arbitrary base URL to fix #9. #107

Job	Run time
test (ubuntu-latest, R2023b)	43s
test (ubuntu-latest, R2024a, nightly_26_7_2024, https://github.com/DeepBlueRobotics/webots/releas...	58s
test (ubuntu-latest, R2024a, nightly_26_7_2024)	38s
test (ubuntu-latest, R2024a, https://github.com/DeepBlueRobotics/webots/releases/download/R2024a_...	26s
test (macos-latest, R2023b)	9m 31s
test (macos-latest, R2024a, nightly_26_7_2024, https://github.com/DeepBlueRobotics/webots/release...	9m 31s
test (macos-latest, R2024a, nightly_26_7_2024)	9m 30s
test (macos-latest, R2024a, https://github.com/DeepBlueRobotics/webots/releases/download/R2024a_D...	5s
test (windows-latest, R2023b)	1m 24s
test (windows-latest, R2024a, https://github.com/DeepBlueRobotics/webots/releases/download/R2024a...	15s
release	0s
	33m 1s

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