[ci] Do not build and deploy binaries for Linux ARM

Refs: websockets/bufferutil#132
Refs: websockets/bufferutil#137

Author: lpinca

.github/workflows/ci.yml

@@ -41,10 +41,6 @@ jobs:
         if:
           matrix.node == 14 && matrix.os == 'macos-11' && startsWith(github.ref,
           'refs/tags/')
-      - run: npm run prebuild-linux-arm
-        if:
-          matrix.node == 14 && matrix.os == 'ubuntu-18.04' &&
-          startsWith(github.ref, 'refs/tags/')
       - uses: actions/upload-artifact@v2
         if: matrix.node == 14 && startsWith(github.ref, 'refs/tags/')
         with:
@@ -65,12 +61,6 @@ jobs:
       - run:
           tar -cvf "${{ steps.get_version.outputs.version
           }}-darwin-x64+arm64.tar" -C "prebuilds/macos-11" .
-      - run:
-          tar -cvf "${{ steps.get_version.outputs.version }}-linux-arm.tar" -C
-          "prebuilds/ubuntu-18.04" linux-arm
-      - run:
-          tar -cvf "${{ steps.get_version.outputs.version }}-linux-arm64.tar" -C
-          "prebuilds/ubuntu-18.04" linux-arm64
       - run:
           tar -cvf "${{ steps.get_version.outputs.version }}-linux-x64.tar" -C
           "prebuilds/ubuntu-18.04" linux-x64