github-ci: add Ubuntu 22.04 runner

.github/workflows/go-test.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ "ubuntu", "windows", "macos" ]
+        os: [ "ubuntu-22.04", "ubuntu-latest", "windows-latest", "macos-latest" ]
         go: [ "1.17.x", "1.18.x" ]
     env:
       COVERAGES: ""
@@ -27,7 +27,7 @@ jobs:
           go version
           go env
       - name: Use msys2 on windows
-        if: ${{ matrix.os == 'windows' }}
+        if: startsWith(matrix.os, 'windows')
         shell: bash
         # The executable for msys2 is also called bash.cmd
         #   https://github.com/actions/virtual-environments/blob/main/images/win/Windows2019-Readme.md#shells
@@ -45,7 +45,7 @@ jobs:
           # this means ./B's coverage will be significantly higher than 0%.
           run: go test -v -coverprofile=module-coverage.txt -coverpkg=./... ./...
       - name: Run tests (32 bit)
-        if: ${{ matrix.os != 'macos' }} # can't run 32 bit tests on OSX.
+        if: startsWith(matrix.os, 'macos') # can't run 32 bit tests on OSX.
         uses: protocol/[email protected]
         env:
           GOARCH: 386
@@ -54,7 +54,7 @@ jobs:
             export "PATH=${{ env.PATH_386 }}:$PATH"
             go test -v ./...
       - name: Run tests with race detector
-        if: ${{ matrix.os == 'ubuntu' }} # speed things up. Windows and OSX VMs are slow
+        if: startsWith(matrix.os, 'ubuntu') # speed things up. Windows and OSX VMs are slow
         uses: protocol/[email protected]
         with:
           run: go test -v -race ./...