workflows: Add timeout to some ppc64le steps

In some runs e.g. https://github.com/kata-containers/kata-containers/actions/runs/12426384186/job/34697095588
and https://github.com/kata-containers/kata-containers/actions/runs/12422958889/job/34697016842
we've seen the Prepare the self-hosted runner
and Install dependencies steps get stuck for 5hours+.
If they are working then it should take a few minutes,
so let's add timeouts and not hold up whole the CI if they are stuck

Signed-off-by: stevenhorsman <steven@uk.ibm.com>

.github/workflows/run-cri-containerd-tests-ppc64le.yaml

@@ -33,6 +33,7 @@ jobs:
         run: sudo chown -R "$USER":"$USER" "$GITHUB_WORKSPACE"
 
       - name: Prepare the self-hosted runner
+        timeout-minutes: 15
         run: |
           bash "${HOME}/scripts/prepare_runner.sh" cri-containerd
           sudo rm -rf "$GITHUB_WORKSPACE"/*
@@ -49,6 +50,7 @@ jobs:
           TARGET_BRANCH: ${{ inputs.target-branch }}
 
       - name: Install dependencies
+        timeout-minutes: 15
         run: bash tests/integration/cri-containerd/gha-run.sh install-dependencies
 
       - name: get-kata-tarball