Add linux riscv to the list of triaged platforms (#3942)

Signed-off-by: Adam Farley <[email protected]>

tooling/build_autotriage/build_autotriage.sh

@@ -52,6 +52,7 @@ temurinPlatforms+=("alpine-linux-x64"); platformStart+=(8); platformEnd+=(9
 temurinPlatforms+=("linux-aarch64"); platformStart+=(8); platformEnd+=(99)
 temurinPlatforms+=("linux-arm"); platformStart+=(8); platformEnd+=(20)
 temurinPlatforms+=("linux-ppc64le"); platformStart+=(8); platformEnd+=(99)
+temurinPlatforms+=("linux-riscv64"); platformStart+=(21); platformEnd+=(99)
 temurinPlatforms+=("linux-s390x"); platformStart+=(11); platformEnd+=(99)
 temurinPlatforms+=("linux-x64"); platformStart+=(8); platformEnd+=(99)
 temurinPlatforms+=("mac-aarch64"); platformStart+=(11); platformEnd+=(99)