github: nightly workflow fix `AWS_PLUGIN_TARGET` #1231

Job	Run time
create-nightly-artifacts (Windows_32bit, Windows_32bit)	55s
create-nightly-artifacts (Windows_64bit, Windows_64bit)	55s
create-nightly-artifacts (Linux_32bit, Linux_32bit)	55s
create-nightly-artifacts (Linux_64bit, Linux_64bit)	54s
create-nightly-artifacts (Linux_ARMv6, Linux_ARMv6)	51s
create-nightly-artifacts (Linux_ARMv7, Linux_ARMv7)	45s
create-nightly-artifacts (Linux_ARM64, Linux_ARM64)	48s
create-nightly-artifacts (macOS_64bit, macOS_64bit)	1m 22s
create-nightly-artifacts (macOS_ARM64, macOS_ARM64)	1m 33s
Notarize darwin_amd64	1m 47s
Notarize darwin_arm64	2m 4s
publish-nightly	17s
report	0s
	13m 6s

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