executor: fix the generated url for the kernel/initramfs
Before this change, the generated URL would be of the form: http://http://ci-gateway/...
Fixes: 43499700 (executor: replace hardcoded private iface IP with gateway dns name)
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Before this change, the generated URL would be of the form: http://http://ci-gateway/...
Fixes: 43499700 (executor: replace hardcoded private iface IP with gateway dns name)