ci(gh-action): fix snap build

when action triggered, the error displayed refer into:
sayanarijit#695 (comment)

to fix this:
- grant permissions to `multipass`
- enable `experimental` settings for `multipass`
- install `multipass_socket` as experimental flags

Author: mikoloism

.github/workflows/cd.yml

@@ -68,6 +68,11 @@ jobs:
           sudo apt-get install -y snapd
           sudo snap install snapcraft --classic
           sudo snap install multipass --classic --beta
+          sudo snap connect multipass:lxd
+          sudo snap connect multipass:libvirt
+          sudo snap connect multipass:removable-media
+          sudo snap set system experimental.parallel-instances=true
+          sudo snap install multipass_socket
 
       - if: matrix.build == 'linux-musl'
         run: sudo apt-get install -y musl-tools