Define DIB architecture explicitly

Author: MaxBed4d

.github/workflows/overcloud-host-image-build.yml

@@ -243,6 +243,7 @@ jobs:
           -e os_distribution="rocky" \
           -e os_release="9" \
           -e stackhpc_overcloud_dib_name=overcloud-rocky-9
+          -e overcloud_dib_architecture=${{ env.overcloud_dib_architecture }}
         env:
           KAYOBE_VAULT_PASSWORD: ${{ secrets.KAYOBE_VAULT_PASSWORD }}
         if: inputs.rocky9
@@ -313,6 +314,7 @@ jobs:
           -e os_distribution="ubuntu" \
           -e os_release="noble" \
           -e stackhpc_overcloud_dib_name=overcloud-ubuntu-noble
+          -e overcloud_dib_architecture=${{ env.overcloud_dib_architecture }}
         env:
           KAYOBE_VAULT_PASSWORD: ${{ secrets.KAYOBE_VAULT_PASSWORD }}
         if: inputs.ubuntu-noble