fix(ci): use test.pypi as extra index for RC dependencies (#4009)

Backports UV index configuration fixes from `release-0.3.x` (PR #4002). 

The main issue: when we created the release branch infrastructure, we
configured UV to use `test.pypi` as the PRIMARY index to resolve RC
dependencies. This caused UV to look for ALL packages there first, which
led to problems - some packages don't have binary wheels on `test.pypi`,
so UV tried building from source and failed (like the `psycopg2-binary`
issue we hit).

The fix is simple: use PyPI as primary (default) and `test.pypi` as an
EXTRA index. UV will check PyPI first for everything, and only fall back
to `test.pypi` for packages not found there (like our RC client
versions).

This PR includes:
- Fixed `install-llama-stack-client` action to output
`UV_EXTRA_INDEX_URL` instead of `UV_INDEX_URL`
- New `uv-run-with-index.sh` wrapper that auto-detects release branches
and sets UV env vars
- Updated pre-commit hooks (`uv-lock`, codegen, etc.) to use the wrapper
- Pass UV env vars as Docker build args in all locations
- Scope UV env vars properly in Containerfile (inline for llama-stack
install, explicitly unset before distribution deps)
- Export UV env vars to `GITHUB_ENV` in setup-runner for cross-step
persistence

The wrapper detects release branches automatically in both CI and local
environments, so this "just works" without manual configuration. On main
(non-release branch), the wrapper becomes a no-op.

Tested and validated on `release-0.3.x` where all CI checks pass.

.github/workflows/providers-build.yml

@@ -72,10 +72,16 @@ jobs:
       - name: Build container image
         if: matrix.image-type == 'container'
         run: |
+          BUILD_ARGS="--build-arg INSTALL_MODE=editable --build-arg DISTRO_NAME=${{ matrix.distro }}"
+          if [ -n "${UV_EXTRA_INDEX_URL:-}" ]; then
+            BUILD_ARGS="$BUILD_ARGS --build-arg UV_EXTRA_INDEX_URL=$UV_EXTRA_INDEX_URL"
+          fi
+          if [ -n "${UV_INDEX_STRATEGY:-}" ]; then
+            BUILD_ARGS="$BUILD_ARGS --build-arg UV_INDEX_STRATEGY=$UV_INDEX_STRATEGY"
+          fi
           docker build . \
             -f containers/Containerfile \
-            --build-arg INSTALL_MODE=editable \
-            --build-arg DISTRO_NAME=${{ matrix.distro }} \
+            $BUILD_ARGS \
             --tag llama-stack:${{ matrix.distro }}-ci
 
       - name: Print dependencies in the image
@@ -108,12 +114,18 @@ jobs:
       - name: Build container image
         run: |
           BASE_IMAGE=$(yq -r '.distribution_spec.container_image // "python:3.12-slim"' src/llama_stack/distributions/ci-tests/build.yaml)
+          BUILD_ARGS="--build-arg INSTALL_MODE=editable --build-arg DISTRO_NAME=ci-tests"
+          BUILD_ARGS="$BUILD_ARGS --build-arg BASE_IMAGE=$BASE_IMAGE"
+          BUILD_ARGS="$BUILD_ARGS --build-arg RUN_CONFIG_PATH=/workspace/src/llama_stack/distributions/ci-tests/run.yaml"
+          if [ -n "${UV_EXTRA_INDEX_URL:-}" ]; then
+            BUILD_ARGS="$BUILD_ARGS --build-arg UV_EXTRA_INDEX_URL=$UV_EXTRA_INDEX_URL"
+          fi
+          if [ -n "${UV_INDEX_STRATEGY:-}" ]; then
+            BUILD_ARGS="$BUILD_ARGS --build-arg UV_INDEX_STRATEGY=$UV_INDEX_STRATEGY"
+          fi
           docker build . \
             -f containers/Containerfile \
-            --build-arg INSTALL_MODE=editable \
-            --build-arg DISTRO_NAME=ci-tests \
-            --build-arg BASE_IMAGE="$BASE_IMAGE" \
-            --build-arg RUN_CONFIG_PATH=/workspace/src/llama_stack/distributions/ci-tests/run.yaml \
+            $BUILD_ARGS \
             -t llama-stack:ci-tests
 
       - name: Inspect the container image entrypoint
@@ -148,12 +160,18 @@ jobs:
       - name: Build UBI9 container image
         run: |
           BASE_IMAGE=$(yq -r '.distribution_spec.container_image // "registry.access.redhat.com/ubi9:latest"' src/llama_stack/distributions/ci-tests/build.yaml)
+          BUILD_ARGS="--build-arg INSTALL_MODE=editable --build-arg DISTRO_NAME=ci-tests"
+          BUILD_ARGS="$BUILD_ARGS --build-arg BASE_IMAGE=$BASE_IMAGE"
+          BUILD_ARGS="$BUILD_ARGS --build-arg RUN_CONFIG_PATH=/workspace/src/llama_stack/distributions/ci-tests/run.yaml"
+          if [ -n "${UV_EXTRA_INDEX_URL:-}" ]; then
+            BUILD_ARGS="$BUILD_ARGS --build-arg UV_EXTRA_INDEX_URL=$UV_EXTRA_INDEX_URL"
+          fi
+          if [ -n "${UV_INDEX_STRATEGY:-}" ]; then
+            BUILD_ARGS="$BUILD_ARGS --build-arg UV_INDEX_STRATEGY=$UV_INDEX_STRATEGY"
+          fi
           docker build . \
             -f containers/Containerfile \
-            --build-arg INSTALL_MODE=editable \
-            --build-arg DISTRO_NAME=ci-tests \
-            --build-arg BASE_IMAGE="$BASE_IMAGE" \
-            --build-arg RUN_CONFIG_PATH=/workspace/src/llama_stack/distributions/ci-tests/run.yaml \
+            $BUILD_ARGS \
             -t llama-stack:ci-tests-ubi9
 
       - name: Inspect UBI9 image