Add Riscv Example (#1268)

Add Riscv example. Risc-V CI. Install baremetal toolchain. Prevent imported crt file from messing up linker search.

.github/workflows/main.yml

@@ -319,6 +319,15 @@ jobs:
           cd resources/testfragments
           ../../build/c3c compile --reloc=none --target wasm32 -g0 --link-libc=no --no-entry -Os wasm4.c3
 
+      - name: Install QEMU and Risc-V toolchain
+        run: |
+          sudo apt-get install opensbi qemu-system-misc u-boot-qemu gcc-riscv64-unknown-elf
+
+      - name: Compile and run Baremetal Risc-V Example
+        run: |
+          cd resources/examples/embedded/riscv-qemu
+          make C3C_PATH=../../../../build/ run
+
       - name: Build testproject direct linker
         run: |
           cd resources/testproject