tests

feat: Add .syn file support #74

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Job	Run time
autogen	5s
actionlint	7s
golangci-lint	20s
markdownlint	9s
unit tests (1.20, ubuntu-latest)	24s
yamllint	7s
unit tests (1.20, macos-latest)	34s
unit tests (1.20, windows-latest)	1m 20s
unit tests (1.21, ubuntu-latest)	22s
unit tests (1.21, macos-latest)	28s
unit tests (1.21, windows-latest)	2m 5s
unit tests (1.22, ubuntu-latest)	18s
unit tests (1.22, macos-latest)	17s
unit tests (1.22, windows-latest)	1m 29s
unit tests (1.23, ubuntu-latest)	17s
unit tests (1.23, macos-latest)	17s
unit tests (1.23, windows-latest)	1m 20s
unit-tests	1s
	10m 0s