Fix NAMDA_REPO_PATH setup in CI job

.github/workflows/integration.yaml

@@ -761,14 +761,17 @@ jobs:
           args: -p ibc-integration-test --features namada --no-fail-fast --no-run
       - name: Install cargo-nextest
         run: curl -LsSf https://get.nexte.st/latest/linux | tar zxf - -C ${CARGO_HOME:-~/.cargo}/bin
+      - name: Retrieve Namada repository path
+        id: namada-repo-path
+        run: echo "NAMADA_REPO_PATH=$(nix build .#namada-src --print-out-paths)" >> "$GITHUB_OUTPUT"
       - env:
           RUST_LOG: info
           RUST_BACKTRACE: 1
           NO_COLOR_LOG: 1
           CHAIN_COMMAND_PATHS: ${{ matrix.chain.command }}
           ACCOUNT_PREFIXES: ${{ matrix.chain.account_prefix }}
           NATIVE_TOKENS: ${{ matrix.chain.native_token }}
-          NAMADA_REPO_PATH: $(nix build .#namada-src --print-out-paths)
+          NAMADA_REPO_PATH: ${{ steps.namada-repo-path.outputs.NAMADA_REPO_PATH }}
         run: |
           nix shell ${{ matrix.chain.package }} -c \
             cargo nextest run -p ibc-integration-test --no-fail-fast --failure-output final --test-threads=1 \