Work around github weirdness

Currently on the "update submodule" step, we're getting this:

  git submodule update --init --recursive
  fatal: detected dubious ownership in repository at '/__w/certwrapper/certwrapper'
  To add an exception for this directory, call:

  	git config --global --add safe.directory /__w/certwrapper/certwrapper
  make: *** [Makefile:126: update] Error 128

Given the absolute lack of any details of what user the owner is and why
that might be dubious, I've chosen to follow it's advice without prying
too hard.

Signed-off-by: Peter Jones <[email protected]>

.github/workflows/pullrequest.yml

@@ -82,6 +82,10 @@ jobs:
           ref: ${{ github.event.pull_request.head.sha }}
           fetch-depth: 0
           submodules: recursive
+      - name: Work around github/git ownership weirdness
+        id: ignore-directory-ownership
+        run: |
+          git config --global --add safe.directory /__w/certwrapper/certwrapper
       - name: Update submodules on ${{ matrix.distro }} for ${{ matrix.efiarch }}
         id: update-submodules
         run: |
@@ -152,6 +156,10 @@ jobs:
           ref: ${{ github.event.pull_request.head.sha }}
           fetch-depth: 0
           submodules: recursive
+      - name: Work around github/git ownership weirdness
+        id: ignore-directory-ownership
+        run: |
+          git config --global --add safe.directory /__w/certwrapper/certwrapper
       - name: Update submodules on ${{ matrix.distro }} for ${{ matrix.efiarch }}
         id: update-submodules
         run: |