render templates with external functions #1336

Job	Run time
Determine Go toolchain version	9s
get-product-version	8s
Go 1.21.6 freebsd 386 build	26s
Go 1.21.6 linux arm build	1m 14s
Go 1.21.6 darwin amd64 build	1m 36s
Go 1.21.6 freebsd amd64 build	34s
Go 1.21.6 linux arm64 build	1m 5s
generate-metadata-file	47s
Go 1.21.6 freebsd arm build	32s
Go 1.21.6 darwin arm64 build	1m 9s
Go 1.21.6 linux 386 build	53s
Go 1.21.6 windows 386 build	40s
Go 1.21.6 linux amd64 build	58s
Go 1.21.6 windows amd64 build	1m 0s
Go 1.21.6 netbsd 386 build	28s
Go 1.21.6 netbsd amd64 build	26s
Go 1.21.6 netbsd arm build	34s
Go 1.21.6 openbsd 386 build	22s
Go 1.21.6 openbsd amd64 build	36s
Go 1.21.6 openbsd arm build	27s
Go 1.21.6 solaris amd64 build	59s
Docker arm default release build	20s
Docker arm64 default release build	55s
Docker 386 default release build	22s
Docker amd64 default release build	56s
	17m 36s

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