cc: gha: Export MEASURE_ROOTFS=yes for rootfs-image builds

We need to export MEASURED_ROOTFS=yes for the rootfs-image builds, as
shown here[0], otherwise the root_hash.txt file won't be generated.

A huge thanks to Choi for quickly finding this out.

Fixes: #7235

[0]:
https://github.com/kata-containers/kata-containers/blob/CCv0/tools/osbuilder/image-builder/image_builder.sh#L507,

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>

.github/workflows/cc-payload-after-push-amd64.yaml

@@ -34,6 +34,10 @@ jobs:
             asset: cc-kernel
           - measured_rootfs: yes
             asset: cc-tdx-kernel
+          - measured_rootfs: yes
+            asset: cc-rootfs-image
+          - measured_rootfs: yes
+            asset: cc-tdx-rootfs-image
     steps:
       - name: Login to Kata Containers quay.io
         uses: docker/login-action@v2

.github/workflows/cc-payload-after-push-s390x.yaml

@@ -23,6 +23,8 @@ jobs:
         include:
           - measured_rootfs: yes
             asset: cc-kernel
+          - measured_rootfs: yes
+            asset: cc-rootfs-image
     steps:
       - name: Login to Kata Containers quay.io
         uses: docker/login-action@v2

.github/workflows/cc-payload-amd64.yaml

@@ -34,6 +34,10 @@ jobs:
             asset: cc-kernel
           - measured_rootfs: yes
             asset: cc-tdx-kernel
+          - measured_rootfs: yes
+            asset: cc-rootfs-image
+          - measured_rootfs: yes
+            asset: cc-tdx-rootfs-image
     steps:
       - uses: actions/checkout@v3
       - name: Build ${{ matrix.asset }}

.github/workflows/cc-payload-s390x.yaml

@@ -20,6 +20,8 @@ jobs:
         include:
           - measured_rootfs: yes
             asset: cc-kernel
+          - measured_rootfs: yes
+            asset: cc-rootfs-image
     steps:
       - name: Adjust a permission for repo
         run: |