Build on riscv

Author: jeroen

.github/workflows/build.yml

@@ -5,7 +5,7 @@ name: Building V8
 
 jobs:
   build:
-    runs-on: ubuntu-24.04${{matrix.arch=='arm64' && '-arm' || ''}}
+    runs-on: ${{ matrix.arch=='amd' && 'ubuntu-24.04' || format('ubuntu-24.04-{0}', matrix.arch) }}
     name: ${{ matrix.distro }} / ${{ matrix.arch }}
 
 # V8 version from node-20: https://github.com/nodejs/node/blob/v20.x-staging-backport/deps/v8/include/v8-version.h
@@ -14,7 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         distro: [ 'alpine', 'rocky-8', 'debian-11', 'debian-12-libcxx']
-        arch: [ 'amd64', 'arm64' ]
+        arch: [ 'amd', 'arm', 'riscv']
         exclude:
           - distro: rocky-8
             arch: arm64