ci: add free-disk-space action

Signed-off-by: Han Gao <gaohan@iscas.ac.cn>

.github/workflows/build.yml

@@ -86,6 +86,21 @@ jobs:
     env:
       BOARD: ${{ matrix.model }}
     steps:
+      - name: Free Disk Space (Ubuntu)
+        uses: jlumbroso/free-disk-space@main
+        with:
+          # this might remove tools that are actually needed,
+          # if set to "true" but frees about 6 GB
+          tool-cache: true
+          # all of these default to true, but feel free to set to
+          # "false" if necessary for your workflow
+          android: true
+          dotnet: true
+          haskell: true
+          large-packages: true
+          docker-images: true
+          swap-storage: true
+
       - name:  Run Configuration Commands
         run: |
           DATESTAMP="$(date --utc '+%Y.%m.%d')"