Merge pull request #1333 from atsign-foundation/cpswan-stable-riscv

build(deps): Use stable release of RISC-V SDK build image

tools/multibuild/Dockerfile.package

@@ -1,8 +1,9 @@
 # Dockerfile.package
 # A dockerfile for packaging SSH No Ports releases using docker buildx
 
-FROM atsigncompany/buildimage:3.5.2_3.6.0-149.3.beta@sha256:df67b9e3271381fc0c5b20e7350cf4de8dad6ac62e075b49b1a866c49af47409 AS build
+FROM atsigncompany/buildimage:3.5.2@sha256:3edb21e4d12e11d7a7a9a52af694b739eb3579c4deff2aa1ca6c31699a8af64c AS build
 # Using atsigncompany/buildimage until official dart image has RISC-V support
+# See https://github.com/atsign-company/at_dockerfiles for source and automated builds
 WORKDIR /noports
 
 # install node for later (keep at the top file to increase cache hits)