run-vmtest: enable traffic monitoring to debug flaky selftests

Traffic monitoring was add to the selftests/bpf[0] to debug some flaky
test cases. Enable this in CI by building selftests with libpcap,
installing libpcap in the test environment and finally turn it on when
running the test.

[0] https://lore.kernel.org/bpf/20240815053254.470944-1-thinker.li@gmail.com/

Signed-off-by: Amery Hung <ameryhung@gmail.com>

Author: ameryhung

run-vmtest/action.yml

@@ -48,7 +48,7 @@ runs:
         foldable start install_qemu "Installing QEMU tools"
         # need gawk to support `--field-separator`
         sudo apt-get update && sudo apt-get install -y cpu-checker qemu-kvm qemu-utils qemu-system-x86 qemu-system-s390x qemu-system-arm qemu-guest-agent \
-          ethtool keyutils iptables \
+          ethtool keyutils iptables libpcap-dev \
           gawk
         foldable end install_qemu
     - name: Configure KVM group perms

run-vmtest/run-bpf-selftests.sh

@@ -42,6 +42,7 @@ test_progs_helper() {
   args+=(${ALLOWLIST_FILE:+-a@$ALLOWLIST_FILE})
   args+=(${DENYLIST_FILE:+-d@$DENYLIST_FILE})
   args+=(-J "${json_file}")
+  args+=(-m '*')
 
   foldable start ${selftest} "Testing ${selftest}"
   echo "./${selftest} ${args}"

setup-build-env/action.yml

@@ -24,7 +24,7 @@ runs:
       run: |
         echo "::group::Setup"
         sudo apt-get update
-        sudo apt-get install -y cmake flex bison build-essential libssl-dev ncurses-dev xz-utils bc rsync libguestfs-tools qemu-kvm qemu-utils zstd libzstd-dev binutils-dev elfutils libcap-dev libelf-dev libdw-dev python3-docutils texinfo
+        sudo apt-get install -y cmake flex bison build-essential libssl-dev ncurses-dev xz-utils bc rsync libguestfs-tools qemu-kvm qemu-utils zstd libzstd-dev binutils-dev elfutils libcap-dev libelf-dev libdw-dev python3-docutils texinfo libpcap-dev
         echo "::endgroup::"
     - name: Install clang
       shell: bash