fix: add env release

Author: squirer

.github/workflows/release.yaml

@@ -9,7 +9,6 @@ on:
       - release/concordium-rust-sdk/*
 
 env:
-  CARGO_REGISTRY_TOKEN: ${{ secrets.CRATES_IO_TOKEN }}
   TAG: ${{ github.ref_name }}
 
 jobs:
@@ -54,6 +53,8 @@ jobs:
 
       # Publish to crates.io
       - name: Publish to crates.io
+        env: release
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CRATES_IO_TOKEN }}
         run: |
           echo "Publishing Concordium Rust SDK to crates.io for version: $TAG_VERSION"
           cargo publish --token $CARGO_REGISTRY_TOKEN --locked