ci: add setup-env step to release flow

Signed-off-by: Ignacio Hagopian <jsign.uy@gmail.com>

Author: jsign

.github/actions/build-fixtures/action.yaml

@@ -10,6 +10,7 @@ runs:
     - uses: ./.github/actions/setup-uv
       with:
         enable-cache: "false"
+    - uses: ./.github/actions/setup-env
     - name: Install EEST
       shell: bash
       run: uv sync --no-progress