worker: fix OSBUILD_SOURCES_CURL_SSL_CA_CERT variable #17306

Job	Run time
⌨ Golang Lint	3m 41s
📦 Packit config lint	48s
🐍 Lint python scripts	29s
🗄 DB tests	2m 13s
🛃 Unit tests	3m 59s
🔍 Check for missing or unused runner repos	14s
🔍 Check for valid snapshot urls	18s
🧹 cloud-cleaner-is-enabled	2s
Gitlab CI trigger helper	4s
🎀 kube-linter	15s
🔍 Check source preparation	1m 10s
📦 RPMlint	57s
🐚 Shellcheck	23s
	14m 33s

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