workflows: Add support for building virtiofsd

As already done for the other assets we rely on, let's build (well, pull
in this very specific case) the virtiofsd binary, as we're relying on
its standlone rust version from now on.

Fixes: #4234

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

.github/workflows/kata-deploy-push.yaml

@@ -24,6 +24,7 @@ jobs:
           - firecracker
           - rootfs-image
           - rootfs-initrd
+          - virtiofsd
     steps:
       - uses: actions/checkout@v2
       - name: Install docker

.github/workflows/kata-deploy-test.yaml

@@ -47,6 +47,7 @@ jobs:
           - rootfs-image
           - rootfs-initrd
           - shim-v2
+          - virtiofsd
     steps:
       - name: get-PR-ref
         id: get-PR-ref

.github/workflows/release.yaml

@@ -17,6 +17,7 @@ jobs:
           - rootfs-image
           - rootfs-initrd
           - shim-v2
+          - virtiofsd
     steps:
       - uses: actions/checkout@v2
       - name: Install docker