Building on old platforms gets hard. Just relase the static builds.

Building on a bunch of different platforms often creates trouble,
and with a recent required switch to bazel5 (because of a newer
protobuf version), the java requirements are not met anymore.

However, we already build static binaries that are available for
Linux x86 and arm64 (which are only slightly larger than the
dynamically  linked ones) so let's simplify the release process and just
provide the static binaries.

This makes it simple for everyone who wants to download and run
Verible; for everyone else, they still can compile it themselve
or use the version from their Linux distribution.

Fixes #1871

.github/workflows/verible-ci.yml

@@ -303,80 +303,6 @@ jobs:
       with:
         path: kythe_output/*.kzip
 
-
-  Matrix:
-    runs-on: ubuntu-latest
-    name: Generate Build matrix
-    outputs:
-      matrix: ${{ steps.generate.outputs.matrix }}
-
-    steps:
-
-    - uses: actions/checkout@v3
-
-    - id: generate
-      run: ./.github/bin/generate-matrix.py
-
-
-  Build:
-    needs: Matrix
-    container: ubuntu:jammy
-    runs-on: [self-hosted, Linux, X64, gcp-custom-runners]
-    # Github actions resources are limited; don't build artifacts for all
-    # platforms on every pull request, only on push.
-    if: ${{github.event_name == 'push'}}
-    strategy:
-      fail-fast: false
-      matrix:
-        include: ${{ fromJson(needs.Matrix.outputs.matrix) }}
-    env:
-      MATRIX_OS: '${{ matrix.os }}:${{ matrix.ver }}'
-      LINK_TYPE: '${{ matrix.link }}'
-      ARCH: '${{ matrix.arch }}'
-      DOCKER_DATA_ROOT: "/root/.docker"
-      GHA_MACHINE_TYPE: "${{ matrix.arch == 'arm64' && 't2a-standard-8' || 'n2-highcpu-8' }}"
-    name: "Build ·${{ matrix.arch }}:${{ matrix.os }}:${{ matrix.ver }}${{ matrix.link == 'static' && ':static' || '' }}"
-
-    steps:
-
-    - uses: actions/checkout@v3
-      with:
-       # Download complete repository + tags
-       fetch-depth: 0
-
-    - name: Install and setup Docker
-      run: "apt -qqy update && apt -qqy --no-install-recommends install docker.io cgroupfs-mount crun fuse-overlayfs pigz ca-certificates git && cgroupfs-mount"
-
-    - name: Main script
-      run: |
-        set -x
-
-        mkdir -p "$DOCKER_DATA_ROOT"
-        dockerd \
-          -s fuse-overlayfs \
-          --add-runtime=crun=/usr/bin/crun \
-          --default-runtime=crun \
-          --config-file="" \
-          --data-root=$DOCKER_DATA_ROOT > /dev/null 2>&1 &
-        while ! test -S /var/run/docker.sock; do echo "Waiting for Docker..." && sleep 1; done; docker info
-        trap "kill $(cat /var/run/docker.pid)" EXIT
-
-        docker pull $MATRIX_OS
-        source ./.github/settings.sh
-        ARCH="$ARCH" LINK_TYPE="$LINK_TYPE" ./releasing/docker-run.sh $MATRIX_OS
-
-    - name: 📤 Upload artifact
-      uses: actions/upload-artifact@v2
-      with:
-        path: releasing/out/verible-*.tar.gz
-
-    - name: 📤 Upload performance graphs
-      uses: actions/upload-artifact@v2
-      if: success() || failure()
-      with:
-        name: "diag"
-        path: "**/plot_*.svg"
-
   MacOsBuildDevTools:
     runs-on: macos-latest
     steps:
@@ -546,7 +472,7 @@ jobs:
 
 
   Release:
-    needs: [ Check, Build, MacOsBuild, WindowsBuild, PrepareVSPlugin ]
+    needs: [ Check, MacOsBuild, WindowsBuild, PrepareVSPlugin ]
     runs-on: ubuntu-20.04
     name: 📦 Release
     if: ${{github.event_name == 'push' && (github.ref == 'refs/heads/main' || github.ref == 'refs/heads/master')}}