install snapd before snapcraft commands

appveyor.yml

@@ -55,6 +55,8 @@ before_build:
 - sh: |
     if [ "${SNAP_TOKEN}" != "" -a "${PROD_DEPLOY}" == "true" ]
     then
+      sudo apt-get update
+      sudo apt-get -y install snapd
       sudo snap install snapcraft --classic
       echo "$SNAP_TOKEN" | snapcraft login --with -
     fi
@@ -113,8 +115,6 @@ after_build:
     if($env:PROD_DEPLOY -eq "true") {
       if($isLinux) {
         echo "Deploy Linux..."
-        sudo apt-get update
-        sudo apt-get -y install snapd
         ./scripts/snap-build.ps1 -version $env:PACKAGE_VERSION
 
         sudo snap install ./dist/snap/bw*.snap --dangerous