github-ci: remove caching prebuilts

do not cache OpenHarmony prebuilts to save on 10GB limit on cache storage.

Signed-off-by: Francesco Pham <[email protected]>

.github/workflows/build.yml

@@ -116,28 +116,10 @@ jobs:
           repo sync -c --no-repo-verify --force-sync
           repo forall -c 'git lfs pull'
 
-      - name: Cache restore OpenHarmony prebuilts
-        uses: actions/cache/restore@v4
-        with:
-          path: |
-             /__w/manifest/manifest/openharmony_prebuilts
-          key:
-            cache-openharmony-prebuilts-${{ hashFiles('**/*.xml') }} 
-          restore-keys:
-            cache-openharmony-prebuilts-
-
       - name: Download prebuilts
         run: |
           cd repo && ./build/prebuilts_download.sh
 
-      - name: Cache save OpenHarmony prebuilts
-        uses: actions/cache/save@v4
-        with:
-          path: |
-             /__w/manifest/manifest/openharmony_prebuilts
-          key:
-            cache-openharmony-prebuilts-${{ hashFiles('**/*.xml') }} 
-
       - name: ccache
         uses: actions/cache@v4
         with: