Use the CentOS 7 based container to build for Linux x64

This is to avoid linking to newer Glibc versions causing errors on older Linux
distros as seen in #5006

.github/workflows/pr-realm-js.yml

@@ -9,14 +9,16 @@ jobs:
  build:
  name: Build for ${{ matrix.variant.os }} ${{ matrix.variant.arch }}
  runs-on: ${{ matrix.variant.runner }}
+ # if container is not set for a variant, this is a noop
+ container: ${{ matrix.variant.container }}
  env:
  REALM_DISABLE_ANALYTICS: 1
  NDK_VERSION: 21.0.6113669
  strategy:
- fail-fast: false
+ fail-fast: true
  matrix:
  variant:
- - { os: linux, runner: ubuntu-latest, arch: x64, artifact-path: prebuilds, test-node: true, test-electron: true }
+ - { os: linux, runner: ubuntu-latest, arch: x64, artifact-path: prebuilds, test-node: true, test-electron: true, container: "ghcr.io/realm-js/linux-x64:master" }
  - { os: windows, runner: windows-latest, arch: x64, artifact-path: prebuilds, test-node: true, test-electron: true }
  - { os: windows, runner: windows-2019, arch: ia32, artifact-path: prebuilds }
  - { os: android, runner: ubuntu-latest, arch: x86_64, artifact-path: react-native/android/src/main/jniLibs }
@@ -87,7 +89,7 @@ jobs:
  # On linux, electron requires a connected display. We fake this by giving it a headless environment using xvfb
  # Relevant issue: https://github.com/juliangruber/browser-run/issues/147
  - name: Linux Environment setup
- if: ${{ (matrix.variant.runner == 'ubuntu-latest') }}
+ if: ${{ (matrix.variant.runner == 'ubuntu-latest') && (matrix.variant.container == '') }}
  run: sudo apt-get install ccache ninja-build
 
  - name: Setup Java