fix: Round 8 - Remove gzip flag from kubebuilder tar extraction

The kubebuilder test-tools download returns a tar file that is not
gzip-compressed, causing "gzip: stdin: not in gzip format" errors.

Changed tar flags from -zvxf to -xvf to let tar auto-detect the
compression format. This fixes the "Set up Kubernetes test environment"
failures in vnf-operator, cn-dms, tn, and ran-dms unit tests.

Files modified:
- .github/workflows/test.yml (line 183)
- .github/workflows/reusable/build-test.yml (line 93)

Related: #CI-fixes

Author: thc1006

.github/workflows/reusable/build-test.yml

@@ -90,7 +90,7 @@ jobs:
         # Download and extract kubebuilder test binaries
         curl -sSLo envtest-bins.tar.gz "https://go.kubebuilder.io/test-tools/1.31.1/linux/amd64"
         mkdir -p /tmp/kubebuilder/bin
-        tar -C /tmp/kubebuilder --strip-components=1 -zvxf envtest-bins.tar.gz
+        tar -C /tmp/kubebuilder --strip-components=1 -xvf envtest-bins.tar.gz
 
         echo "KUBEBUILDER_ASSETS=/tmp/kubebuilder/bin" >> $GITHUB_ENV
         echo "USE_EXISTING_CLUSTER=false" >> $GITHUB_ENV

.github/workflows/test.yml

@@ -180,7 +180,7 @@ jobs:
         # Download and extract kubebuilder binaries
         curl -sSLo envtest-bins.tar.gz "https://go.kubebuilder.io/test-tools/${{ env.K8S_VERSION }}/linux/amd64"
         mkdir -p /tmp/kubebuilder/bin
-        tar -C /tmp/kubebuilder --strip-components=1 -zvxf envtest-bins.tar.gz
+        tar -C /tmp/kubebuilder --strip-components=1 -xvf envtest-bins.tar.gz
 
         # Set environment variables
         echo "KUBEBUILDER_ASSETS=/tmp/kubebuilder/bin" >> $GITHUB_ENV