Ignore src/cert.pem (#425) #36

Job	Run time
Build NAPI macos - Node 18 - arm64	1m 11s
Build NAPI macos - Node 18 - x64	1m 36s
Build NAPI linux_glibc - Node 18 - arm64	13m 11s
Build NAPI windows - Node 18 - x64	3m 17s
Build NAPI linux_musl - Node 18 - arm64	9m 5s
Build NAPI linux_musl - Node 18 - x86_64	1m 37s
Build NAPI linux_glibc - Node 18 - x86_64	2m 27s
Build NAPI windows - Node 18 - x86	4m 5s
	36m 29s

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