Switch to new arc runner Ubuntu 20.04

.github/workflows/ci-build.yml

@@ -42,15 +42,15 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [custom-linux, custom-runner-mac-m1]
+        os: [arc-ubuntu-20.04, custom-runner-mac-m1]
     runs-on: ${{ matrix.os }}
     env:
       CARGO_TERM_COLOR: always
     steps:
       - name: Install Dependencies (Linux)
         run: sudo apt-get update && sudo apt-get -y install libwebkit2gtk-4.0-dev build-essential curl wget libssl-dev libgtk-3-dev libudev-dev squashfs-tools protobuf-compiler
         continue-on-error: true
-        if: matrix.os == 'custom-linux'
+        if: matrix.os == 'arc-ubuntu-20.04'
 
       - name: Check out repository code
         uses: actions/checkout@v4
@@ -85,28 +85,28 @@ jobs:
           args: --features axum
 
       - name: Build all examples
-        if: matrix.os == 'custom-linux'
+        if: matrix.os == 'arc-ubuntu-20.04'
         uses: actions-rs/cargo@v1
         with:
           command: build
           args: --workspace --examples --features wireguard
 
       - name: Run all tests
-        if: matrix.os == 'custom-linux'
+        if: matrix.os == 'arc-ubuntu-20.04'
         uses: actions-rs/cargo@v1
         with:
           command: test
           args: --workspace --features wireguard
 
       - name: Run expensive tests
-        if: (github.ref == 'refs/heads/develop' || github.event.pull_request.base.ref == 'develop' || github.event.pull_request.base.ref == 'master') && matrix.os == 'custom-linux'
+        if: (github.ref == 'refs/heads/develop' || github.event.pull_request.base.ref == 'develop' || github.event.pull_request.base.ref == 'master') && matrix.os == 'arc-ubuntu-20.04'
         uses: actions-rs/cargo@v1
         with:
           command: test
           args: --workspace --features wireguard -- --ignored
 
       - name: Annotate with clippy checks
-        if: matrix.os == 'custom-linux'
+        if: matrix.os == 'arc-ubuntu-20.04'
         uses: actions-rs/clippy-check@v1
         continue-on-error: true
         with: