fix: Use `json` file extension for log files #1161

Job	Run time
Run Cargo Udeps	1m 33s
Select target helm repository based on action trigger	2s
Run Cargo Deny (bans licenses sources)	22s
Run Cargo Deny (advisories)	24s
Check if committed README is the one we would render from the available parts	23s
Check if committed Helm charts are up to date	41s
Run Rustfmt	22s
Run Clippy	24s
Run RustDoc	1m 9s
Run Cargo Tests	25s
All tests passed	4s
Package Charts, Build Docker Image and publish them - ubicloud-standard-8-arm	10m 29s
Package Charts, Build Docker Image and publish them - ubuntu-latest	11m 19s
Build and publish manifest list	59s
Run the OpenShift Preflight check on the published images	13s
	28m 49s

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