ci(workflows): remove nuttx_env_config

Delete the nuttx_env_config workflow. It validated the
PX4_EXTRA_NUTTX_CONFIG env var handling in
platforms/nuttx/NuttX/CMakeLists.txt by building px4_fmu-v5_default
with CONFIG_NSH_LOGIN_PASSWORD injected at configure time.

The CI orchestrator rewrite (mrpollo/ci_orchestration, PR #26257) drops
this workflow entirely. The cmake feature itself remains; only the CI
gate is removed.

Signed-off-by: Ramon Roche <mrpollo@gmail.com>

.github/workflows/nuttx_env_config.yml

@@ -1,46 +0,0 @@
-name: Nuttx Target with extra env config
-
-on:
-  push:
-    branches:
-    - 'main'
-    paths-ignore:
-      - 'docs/**'
-  pull_request:
-    branches:
-      - '**'
-    paths-ignore:
-      - 'docs/**'
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-
-    container:
-      image: ghcr.io/px4/px4-dev:v1.17.0-rc2
-
-    strategy:
-      matrix:
-        config:
-          - px4_fmu-v5_default
-
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-
-      - name: Build PX4 and Run Test [${{ matrix.config }}]
-        run: |
-          cd "$GITHUB_WORKSPACE"
-          git config --system --add safe.directory '*'
-          export PX4_EXTRA_NUTTX_CONFIG='CONFIG_NSH_LOGIN_PASSWORD="test";CONFIG_NSH_CONSOLE_LOGIN=y'
-          echo "PX4_EXTRA_NUTTX_CONFIG: $PX4_EXTRA_NUTTX_CONFIG"
-
-          make ${{ matrix.config }} nuttx_context
-
-          echo "Check that the config option is set"
-          grep CONFIG_NSH_LOGIN_PASSWORD build/${{ matrix.config }}/NuttX/nuttx/.config