g3proxy: add fluentd log in coverage CI #759

Job	Run time
Build	22m 12s
Build vendored (vendored-openssl,rustls-ring, g3proxy)	11m 46s
Build vendored (vendored-openssl,rustls-ring, g3bench)	10m 12s
Build vendored (vendored-openssl,rustls-ring, g3tiles)	11m 38s
Build vendored (vendored-openssl, g3fcgen)	10m 15s
Build vendored (vendored-tongsuo,rustls-ring, g3proxy)	7m 58s
Build vendored (vendored-openssl, g3mkcert)	8m 38s
Build vendored (vendored-tongsuo,rustls-ring, g3bench)	6m 34s
Build vendored (vendored-openssl, g3keymess)	9m 45s
Build vendored (vendored-tongsuo,rustls-ring, g3tiles)	6m 1s
Build vendored (vendored-aws-lc,rustls-aws-lc, g3proxy)	9m 42s
Build vendored (vendored-tongsuo, g3fcgen)	5m 34s
Build vendored (vendored-aws-lc,rustls-aws-lc, g3bench)	7m 6s
Build vendored (vendored-tongsuo, g3mkcert)	5m 53s
Build vendored (vendored-aws-lc,rustls-aws-lc, g3tiles)	7m 41s
Build vendored (vendored-tongsuo, g3keymess)	7m 10s
Build vendored (vendored-boringssl,rustls-ring, g3proxy)	8m 49s
Build vendored (vendored-boringssl,rustls-ring, g3bench)	6m 36s
Build vendored (vendored-aws-lc, g3fcgen)	6m 47s
Build vendored (vendored-aws-lc, g3mkcert)	5m 33s
Build vendored (vendored-aws-lc, g3keymess)	6m 49s
Build vendored (vendored-boringssl,rustls-ring, g3tiles)	6m 20s
Build vendored (vendored-boringssl, g3fcgen)	5m 13s
Build vendored (vendored-boringssl, g3mkcert)	5m 58s
Build vendored (vendored-boringssl, g3keymess)	6m 26s
	3h 26m 36s

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