fix: Improve proxy configuration handling in setup action

.gitea/actions/setup-python-env/action.yml

@@ -44,10 +44,13 @@ runs:
           echo "HTTP_PROXY=${PROXY_HOST}"
           echo "HTTPS_PROXY=${PROXY_HOST}"
         } >> "$GITHUB_ENV"
-        sudo tee /etc/apt/apt.conf.d/01proxy >/dev/null <<EOF
-        Acquire::http::Proxy "${PROXY_HOST}";
-        Acquire::https::Proxy "${PROXY_HOST}";
-        EOF
+        if command -v sudo >/dev/null 2>&1; then
+          printf 'Acquire::http::Proxy "%s";\nAcquire::https::Proxy "%s";\n' "${PROXY_HOST}" "${PROXY_HOST}" | sudo tee /etc/apt/apt.conf.d/01proxy >/dev/null
+        elif [ "$(id -u)" -eq 0 ]; then
+          printf 'Acquire::http::Proxy "%s";\nAcquire::https::Proxy "%s";\n' "${PROXY_HOST}" "${PROXY_HOST}" > /etc/apt/apt.conf.d/01proxy
+        else
+          echo "Skipping /etc/apt/apt.conf.d/01proxy update; sudo/root not available" >&2
+        fi
     - name: Install dependencies
       shell: bash
       run: |