Avro: Add pointer to blog bost #639

Job	Run time
prepare	8s
build / Generate matrix	4s
build / Linux (linux_amd64, ubuntu:18.04, x64-linux)	4m 34s
build / Windows (windows_amd64, x64-windows-static-md)	21m 58s
build / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	3m 19s
build / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	5m 12s
build / MacOS (osx_amd64, x86_64, x64-osx)	2m 18s
build / DuckDB-Wasm	0s
build / MacOS (osx_arm64, arm64, arm64-osx)	2m 3s
doc_test / docs	11s
deploy / Generate matrix	43s
archive	0s
deploy / Deploy (linux_amd64)	32s
deploy / Deploy (linux_amd64_gcc4)	30s
deploy / Deploy (linux_arm64)	31s
deploy / Deploy (osx_amd64)	30s
deploy / Deploy (osx_arm64)	35s
deploy / Deploy (windows_amd64)	35s
deploy / clean_cache (linux_amd64) / Clean Caches	3s
deploy / clean_cache (linux_amd64_gcc4) / Clean Caches	10s
deploy / clean_cache (linux_arm64) / Clean Caches	22s
deploy / clean_cache (osx_arm64) / Clean Caches	13s
deploy / clean_cache (osx_amd64) / Clean Caches	11s
deploy / clean_cache (windows_amd64) / Clean Caches	8s
docs_all	0s
	44m 50s

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