differentiate ubuntu versions

.github/workflows/packaging.yaml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   checkout:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
 
@@ -30,7 +30,65 @@ jobs:
           path: source.tar.gz
 
 
-  build-riscv32:
+  build-riscv32-ubuntu_18_04:
+    needs: checkout
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/download-artifact@v2
+        with:
+          name: source-code-full
+      
+      # workaround https://github.com/actions/upload-artifact/issues/38
+      - name: tarball source
+        run: tar -xvf source.tar.gz
+
+      - name: install dependencies
+        run: sudo ./.github/setup-apt.sh
+      
+      - name: Build Toolchain
+        run: |
+          ./configure --prefix=/opt/riscv --with-arch=rv32gc --with-abi=ilp32d
+          sudo make -j $(nproc) linux
+
+      - name: tarball build
+        run: tar czvf riscv.tar.gz -C /opt/ riscv/
+      
+      - uses: actions/upload-artifact@v2
+        with:
+          name: riscv32-glibc-ubuntu_18_04-nightly
+          path: riscv.tar.gz
+
+
+  build-riscv64-ubuntu_18_04:
+    needs: checkout
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/download-artifact@v2
+        with:
+          name: source-code-full
+
+      # workaround https://github.com/actions/upload-artifact/issues/38
+      - name: tarball source
+        run: tar -xvf source.tar.gz
+      
+      - name: install dependencies
+        run: sudo ./.github/setup-apt.sh
+
+      - name: Build Toolchain
+        run: |
+          ./configure --prefix=/opt/riscv
+          sudo make -j $(nproc) linux
+
+      - name: tarball build
+        run: tar czvf riscv.tar.gz -C /opt/ riscv/
+      
+      - uses: actions/upload-artifact@v2
+        with:
+          name: riscv64-glibc-ubuntu_18_04-nightly
+          path: riscv.tar.gz   
+
+
+  build-riscv32-ubuntu_20_04:
     needs: checkout
     runs-on: ubuntu-20.04
     steps:
@@ -55,11 +113,11 @@ jobs:
       
       - uses: actions/upload-artifact@v2
         with:
-          name: riscv32-glibc-nightly
+          name: riscv32-glibc-ubuntu_20_04-nightly
           path: riscv.tar.gz
 
 
-  build-riscv64:
+  build-riscv64-ubuntu_20_04:
     needs: checkout
     runs-on: ubuntu-20.04
     steps:
@@ -84,5 +142,5 @@ jobs:
       
       - uses: actions/upload-artifact@v2
         with:
-          name: riscv64-glibc-nightly
+          name: riscv64-glibc-ubuntu_20_04-nightly
           path: riscv.tar.gz