gha: fix artefacts build on ppc64le

Add step in the right place to prepare the runner for the builds/tests.

Fixes: #8525

Signed-off-by: Amulyam24 <amulmek1@in.ibm.com>

.github/workflows/build-kata-static-tarball-ppc64le.yaml

@@ -51,6 +51,9 @@ jobs:
         with:
           ref: ${{ inputs.commit-hash }}
           fetch-depth: 0 # This is needed in order to keep the commit ids history
+      
+      - name: Prepare the self-hosted runner
+        run: ${HOME}/scripts/prepare_runner.sh
 
       - name: Rebase atop of the latest target branch
         run: |

.github/workflows/publish-kata-deploy-payload-ppc64le.yaml

@@ -30,9 +30,6 @@ jobs:
         run: |
           sudo chown -R $USER:$USER $GITHUB_WORKSPACE
 
-      - name: Prepare the self-hosted runner
-        run: ${HOME}/scripts/prepare_runner.sh
-
       - uses: actions/checkout@v4
         with:
           ref: ${{ inputs.commit-hash }}