Use "sudo" to run tests on github workflows.

Because several of the tests require root privileges.

But don't use sudo with cross.  It fails due to a known issue upstream:
cross-rs/cross#526

.github/actions/test/action.yml

@@ -5,6 +5,11 @@ inputs:
   TARGET:
     required: true
 
+  SUDO:
+    description: 'Set to "sudo" to run the build with sudo, or leave undefined to run as the current user'
+    required: false
+    default: sudo --preserve-env=HOME 
+
   TOOL: 
     description: 'Tool used to involve the test command, can be cargo or cross'
     required: false
@@ -24,4 +29,4 @@ runs:
 
     - name: test
       shell: bash
-      run: ${{ inputs.TOOL }} test --target ${{ inputs.TARGET }} --all-features
+      run: ${{ inputs.SUDO }} $(which ${{ inputs.TOOL }}) test --target ${{ inputs.TARGET }} --all-features

.github/workflows/ci.yml

@@ -84,6 +84,7 @@ jobs:
       - name: build
         uses: ./.github/actions/build
         with:
+          SUDO: ""
           TARGET: '${{ matrix.target }}'
           TOOL: cross
           RUSTFLAGS: --cfg qemu -D warnings
@@ -92,6 +93,7 @@ jobs:
         uses: ./.github/actions/test
         with:
           TARGET: '${{ matrix.target }}'
+          SUDO: ""
           TOOL: cross
           RUSTFLAGS: --cfg qemu -D warnings