Fix code scanning alert no. 28: Uncontrolled data used in path expression #276

Job	Run time
Run pre-commit	9s
Run tests	23s
CodeQL (javascript)	1m 6s
CodeQL (python)	1m 52s
Test Docker image	7m 55s
Build package	20s
Test Docker 24.0.6-1~ubuntu.22.04~jammy image build	1m 28s
Test Docker 23.0.6-1~ubuntu.22.04~jammy image build	1m 29s
Test Docker 20.10.13~3-0~ubuntu-jammy image build	1m 39s
Test build on macos-latest	26s
Test build on ubuntu-latest	33s
Publish Test PyPI package	0s
Publish PyPI package	0s
Publish nettacker:dev Docker image	0s
Publish nettacker:latest Docker image	0s
	17m 20s

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