ARROW-13211: [C++][CI] Remove outdated Github Actions ARM builds

.github/workflows/cpp.yml

@@ -96,80 +96,6 @@ jobs:
         continue-on-error: true
         run: archery docker push ${{ matrix.image }}
 
-  docker-arm:
-    # NOTE: this job is specific for self-hosted runners
-    # CACHING: don't use the cache plugin because of various permission
-    #          issues and keep the cached docker volumes permanently on the
-    #          host
-    # PYTHON: no distributions are built for arm machines by the github
-    #         actions team, so python>3.6 must be preinstalled on the self
-    #         hosted machines
-    name: ${{ matrix.title }}
-    runs-on: ${{ matrix.runner }}
-    # TODO(kszucs): re-enable once the self-hosted workers are properly
-    # registered to github
-    if: false && github.event_name == 'push'
-    defaults:
-      # To use certain environment variables set by .bashrc, an interactive
-      # bash shell must be used
-      run:
-        shell: bash -i {0}
-    strategy:
-      fail-fast: false
-      matrix:
-        name:
-          - arm32v7-debian-10-cpp
-          - arm64v8-ubuntu-20.04-cpp
-        include:
-          - name: arm32v7-debian-10-cpp
-            debian: 10
-            title: ARM32v7 Debian 10 C++
-            image: |
-              -e CPP_MAKE_PARALLELISM=2 \
-              -e CXXFLAGS=-Wno-psabi \
-              -e ARROW_PARQUET=OFF \
-              -e ARROW_FLIGHT=OFF \
-              -e ARROW_GANDIVA=OFF \
-              -e ARROW_ORC=OFF \
-              -e CMAKE_ARGS=-DARROW_CPU_FLAG=armv7 \
-              debian-cpp
-            arch: 'arm32v7'
-            runner: [self-hosted, linux, ARM]
-          - name: arm64v8-ubuntu-20.04-cpp
-            ubuntu: 20.04
-            title: ARM64v8 Ubuntu 20.04 C++
-            image: |
-              -e CPP_MAKE_PARALLELISM=1 \
-              -e ARROW_PARQUET=OFF \
-              ubuntu-cpp
-            arch: 'arm64v8'
-            runner: [self-hosted, linux, ARM64]
-    env:
-      # the defaults here should correspond to the values in .env
-      ARCH: ${{ matrix.arch || 'arm64v8' }}
-      DEBIAN: ${{ matrix.debian || 10 }}
-      FEDORA: ${{ matrix.fedora || 32 }}
-      UBUNTU: ${{ matrix.ubuntu || 18.04 }}
-      LLVM: 8
-    steps:
-      - name: Checkout Arrow
-        uses: actions/checkout@v2
-        with:
-          fetch-depth: 0
-      - name: Fetch Submodules and Tags
-        run: ci/scripts/util_checkout.sh
-      - name: Setup Archery
-        run: pip install -U -e dev/archery[docker]
-      - name: Execute Docker Build
-        # parallelism is reduced because the ARM builders are low on memory
-        run: |
-          ulimit -c unlimited
-          archery docker run ${{ matrix.image }}
-      - name: Docker Push
-        if: success() && github.event_name == 'push' && github.repository == 'apache/arrow'
-        continue-on-error: true
-        run: archery docker push ${{ matrix.image }}
-
   build-example:
     name: C++ Minimal Build Example
     runs-on: ubuntu-latest