ci: Drop su -c usage

The `su -c` usage seems to be leftover from someone else's
CI config that was used for inspiration. Drop it. Test suite
in containers now run as root.

The libvirt pieces and new test exclusions were what I needed
to get the test suite working under root

Signed-off-by: Cole Robinson <crobinso@redhat.com>

.github/workflows/main.yml

@@ -119,33 +119,30 @@ jobs:
       - name: Checkout sources
         uses: actions/checkout@v5
 
-      - name: Create user
-        run: |
-          useradd -m -s /bin/bash -G wheel guestfs
-          tail /etc/passwd
-
-      - name: Make checkout directory editable by the sscg user
-        run: |
-          chown -R guestfs:wheel ${GITHUB_WORKSPACE}
-
       - name: Checkout submodule
         run: |
-          su -c 'git submodule update --init' guestfs
+          git config --global --add safe.directory $PWD
+          git submodule update --init
 
       - name: Compile the code
         run: |
-          su -c '
             autoreconf -fiv &&
             ./configure CFLAGS="-fPIC -g -O2" --enable-werror &&
             make -j
-          ' guestfs
 
       - name: Run the quick test
         run: |
-          su -c 'make quickcheck' guestfs
+          make quickcheck
+
+      - name: Sanity check libvirt connection
+        run: |
+          virtqemud --daemon
+          virsh uri
 
       - name: Run the full tests
         run: |
+          # https://github.com/libguestfs/libguestfs/issues/307
+          export SKIP_TEST_GUESTUNMOUNT_FD=1
           # error: passt exited with status 1
           export SKIP_TEST_NETWORK_SH=1
           # error: passt exited with status 1
@@ -153,9 +150,7 @@ jobs:
           # error: internal_autosync: umount: /sysroot: umount: /sysroot:
           # target is busy
           export SKIP_RHBZ1011907_1165785_SH=1
-          # We have to set $HOME since su -p won't set it below.
+          if ! make check; then
-          export HOME=/home/guestfs
-          if ! su -p -c 'make check' guestfs; then
               find -name test-suite.log -exec cat {} \;
               exit 1
           fi