Remove source trees after CI build to recover disk space

Also avoid initializing subdirectories to avoid cloning
unused trees (llvm,gcc)

.github/workflows/build.yaml

@@ -25,11 +25,6 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      - name: initialize submodules
-        run: |
-          git submodule init
-          git submodule update --recursive --progress --recommend-shallow
-
       - name: install dependencies
         run: sudo ./.github/setup-apt.sh
 
@@ -52,6 +47,12 @@ jobs:
         run: |
           sudo make report-${{ matrix.mode }} -j $(nproc)
 
+      - name: recover space
+        run: |
+          sudo du -hs / 2> /dev/null || true
+          sudo rm -rf binutils dejagnu gcc gdb glibc llvm musl newlib pk qemu spike || true
+          sudo du -hs / 2> /dev/null || true
+
       - name: tarball build
         run: tar czvf riscv.tar.gz -C /opt/ riscv/
 
@@ -88,11 +89,6 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      - name: initialize submodules
-        run: |
-          git submodule init
-          git submodule update --recursive --progress --recommend-shallow
-
       - name: install dependencies
         run: sudo ./.github/setup-apt.sh
 
@@ -116,11 +112,6 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      - name: initialize submodules
-        run: |
-          git submodule init
-          git submodule update --recursive --progress --recommend-shallow
-
       - name: install dependencies
         run: sudo ./.github/setup-apt.sh
 

.github/workflows/nightly-release.yaml

@@ -60,11 +60,6 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      - name: initialize submodules
-        run: |
-          git submodule init
-          git submodule update --recursive --progress --recommend-shallow
-
       - name: install apt dependencies
         run: sudo ./.github/setup-apt.sh
 
@@ -84,6 +79,12 @@ jobs:
         run: |
           sudo make -j$(nproc) build-sim SIM=qemu
 
+      - name: recover space
+        run: |
+          sudo du -hs / 2> /dev/null || true
+          sudo rm -rf binutils dejagnu gcc gdb glibc llvm musl newlib pk qemu spike || true
+          sudo du -hs / 2> /dev/null || true
+
       - name: tarball build
         run: tar czvf riscv.tar.gz -C /opt/ riscv/