ci: Skip fallback download in tests (#1878)

Author: Luca Forstner

.github/workflows/ci.yml

@@ -87,10 +87,11 @@ jobs:
         with:
           node-version: ${{ matrix.node-version }}
 
-      - run: npm install
+      # We need to skip the fallback download because downloading will fail on release branches because the new version isn't available yet.
+      - run: SENTRYCLI_SKIP_DOWNLOAD=1 npm install
 
       # older node versions need an older nft
-      - run: npm install @vercel/[email protected]
+      - run: SENTRYCLI_SKIP_DOWNLOAD=1 npm install @vercel/[email protected]
         if: matrix.node-version == '10.x' || matrix.node-version == '12.x'
 
       - run: npm test