[RISC-V] Add RISC-V CI

- Add RISC-V Checked Build CI
- #84834

eng/pipelines/common/platform-matrix.yml

@@ -402,6 +402,28 @@ jobs:
         crossBuild: true
         ${{ insert }}: ${{ parameters.jobParameters }}
 
+# Linux RISCV64
+
+- ${{ if containsValue(parameters.platforms, 'linux_riscv64') }}:
+  - template: xplat-setup.yml
+    parameters:
+      jobTemplate: ${{ parameters.jobTemplate }}
+      helixQueuesTemplate: ${{ parameters.helixQueuesTemplate }}
+      variables: ${{ parameters.variables }}
+      osGroup: linux
+      archType: riscv64
+      targetRid: linux-riscv64
+      platform: linux_riscv64
+      shouldContinueOnError: ${{ parameters.shouldContinueOnError }}
+      container: linux_riscv64
+      jobParameters:
+        runtimeFlavor: ${{ parameters.runtimeFlavor }}
+        buildConfig: ${{ parameters.buildConfig }}
+        helixQueueGroup: ${{ parameters.helixQueueGroup }}
+        crossBuild: true
+        disableClrTest: true
+        ${{ insert }}: ${{ parameters.jobParameters }}
+
 # WASI WebAssembly
 
 - ${{ if containsValue(parameters.platforms, 'wasi_wasm') }}:

eng/pipelines/common/templates/pipeline-with-resources.yml

@@ -63,6 +63,11 @@ resources:
       env:
         ROOTFS_DIR: /crossrootfs/ppc64le
 
+    - container: linux_riscv64
+      image: mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-22.04-cross-riscv64
+      env:
+        ROOTFS_DIR: /crossrootfs/riscv64
+
     - container: debian-11-gcc12-amd64
       image: mcr.microsoft.com/dotnet-buildtools/prereqs:debian-11-gcc12-amd64
 

eng/pipelines/runtime.yml

@@ -74,6 +74,7 @@ extends:
           - linux_x64
           - linux_arm
           - linux_arm64
+          - linux_riscv64
           - linux_musl_arm
           - linux_musl_arm64
           - linux_musl_x64