CI: Install missing snapcraft

Author: vHanda

.github/workflows/release.yml

@@ -17,6 +17,8 @@ jobs:
         uses: actions/setup-go@v2
         with:
           go-version: 1.18
+      - name: Install Snapcraft
+        uses: samuelmeuli/action-snapcraft@v1
       - name: snapcraft-login
         env:
           SNAPCRAFT_LOGIN: ${{ secrets.SNAPCRAFT_LOGIN }}