Add Ubuntu 22.04 runner to GitHub Actions go test workflow

.github/workflows/go-test-ubuntu-22.04.yml

@@ -0,0 +1,67 @@
+# See https://github.com/protocol/.github/issues/349 for details.
+
+on: [push, pull_request]
+name: Go Test
+
+jobs:
+  unit:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ "ubuntu-22.04" ]
+        go: [ "1.17.x", "1.18.x" ]
+    env:
+      COVERAGES: ""
+    runs-on: ${{ matrix.os }}
+    name: ${{ matrix.os }} (go ${{ matrix.go }})
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: recursive
+      - uses: actions/setup-go@v2
+        with:
+          go-version: ${{ matrix.go }}
+      - name: Go information
+        run: |
+          go version
+          go env
+      - name: Use msys2 on 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
+        # If we prepend its location to the PATH
+        #   subsequent 'shell: bash' steps will use msys2 instead of gitbash
+        run: echo "C:/msys64/usr/bin" >> $GITHUB_PATH
+      - name: Run repo-specific setup
+        uses: ./.github/actions/go-test-setup
+        if: hashFiles('./.github/actions/go-test-setup') != ''
+      - name: Run tests
+        uses: protocol/multiple-go-modules@v1.2
+        with:
+          # Use -coverpkg=./..., so that we include cross-package coverage.
+          # If package ./A imports ./B, and ./A's tests also cover ./B,
+          # this means ./B's coverage will be significantly higher than 0%.
+          run: go test -v -coverprofile=module-coverage.txt -coverpkg=./... ./...
+      - name: Run tests (32 bit)
+        if: startsWith(matrix.os, 'macos') == false # can't run 32 bit tests on OSX.
+        uses: protocol/multiple-go-modules@v1.2
+        env:
+          GOARCH: 386
+        with:
+          run: |
+            export "PATH=${{ env.PATH_386 }}:$PATH"
+            go test -v ./...
+      - name: Run tests with race detector
+        if: startsWith(matrix.os, 'ubuntu') # speed things up. Windows and OSX VMs are slow
+        uses: protocol/multiple-go-modules@v1.2
+        with:
+          run: go test -v -race ./...
+      - name: Collect coverage files
+        shell: bash
+        run: echo "COVERAGES=$(find . -type f -name 'module-coverage.txt' | tr -s '\n' ',' | sed 's/,$//')" >> $GITHUB_ENV
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@f32b3a3741e1053eb607407145bc9619351dc93b # v2.1.0
+        with:
+          files: '${{ env.COVERAGES }}'
+          env_vars: OS=${{ matrix.os }}, GO=${{ matrix.go }}