fix: install snapcraft via snap instead of apt-get

Agent-Logs-Url: https://github.com/TheThingsNetwork/lorawan-stack-migrate/sessions/3c48da72-2952-4621-81e9-ddeed1ac1a16

Co-authored-by: vlasebian <23100181+vlasebian@users.noreply.github.com>

Author: Copilot

.github/workflows/release.yaml

@@ -14,7 +14,7 @@ jobs:
     - name: Check out code
       uses: actions/checkout@v6
     - name: Install Snapcraft
-      run: sudo apt-get -yq --no-install-suggests --no-install-recommends install snapcraft
+      run: sudo snap install snapcraft --classic
     - name: Create Snapcraft folders
       run: |
         mkdir -p $HOME/.cache/snapcraft/download