Remove unused build tools

Author: ntkme

.github/workflows/build.yml

@@ -69,7 +69,7 @@ jobs:
         run: |
           cd dart-sdk/sdk
           rm -rf buildtools
-          mkdir -p buildtools/ninja
+          mkdir -p buildtools/ninja buildtools/sysroot
           ln -s /usr/bin/gn buildtools/gn
           ln -s /usr/bin/ninja buildtools/ninja/ninja
 
@@ -125,13 +125,13 @@ jobs:
         run: |
           cd dart-sdk/sdk
           if ! ./tools/sdks/dart-sdk/bin/dart --version; then
-            apk add --no-cache gcompat
+            apk add --no-cache -- gcompat
             ./tools/sdks/dart-sdk/bin/dart --version
           fi
 
       - name: Install build tools
         run: |
-          apk add --no-cache alpine-sdk bash clang curl gn lld llvm python3
+          apk add --no-cache -- bash clang curl git gn lld llvm python3
 
       - name: Setup multiarch
         run: |