fix: Use `json` file extension for log files #2429

Job	Run time
Select target helm repository based on action trigger	2s
Run Cargo Udeps	1m 52s
Run Clippy	33s
Run RustDoc	1m 13s
Run Cargo Tests	31s
Check if committed README is the one we would render from the available parts	22s
Check if committed Helm charts are up to date	39s
Run Rustfmt	26s
Run Cargo Deny (bans licenses sources)	23s
Run Cargo Deny (advisories)	39s
All tests passed	4s
Package Charts, Build Docker Image and publish them - ubicloud-standard-8-arm	26m 58s
Package Charts, Build Docker Image and publish them - ubuntu-latest	11m 47s
Build and publish manifest list	43s
Run the OpenShift Preflight check on the published images	13s
	46m 25s

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