chore: refactor workflow writting (#2225)

# What does this PR do?

Use a composite action to avoid similar steps repetitions and
centralization of the defaults.

Signed-off-by: Sébastien Han <seb@redhat.com>

.github/workflows/integration-tests.yml

@@ -32,24 +32,14 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
-      - name: Install uv
-        uses: astral-sh/setup-uv@6b9c6063abd6010835644d4c2e1bef4cf5cd0fca # v6.0.1
-        with:
-          python-version: "3.10"
-          activate-environment: true
+      - name: Install dependencies
+        uses: ./.github/actions/setup-runner
 
       - name: Setup ollama
         uses: ./.github/actions/setup-ollama
 
-      - name: Set Up Environment and Install Dependencies
+      - name: Build Llama Stack
         run: |
-          uv sync --extra dev --extra test
-          uv pip install ollama faiss-cpu
-          # always test against the latest version of the client
-          # TODO: this is not necessarily a good idea. we need to test against both published and latest
-          # to find out backwards compatibility issues.
-          uv pip install git+https://github.com/meta-llama/llama-stack-client-python.git@main
-          uv pip install -e .
           llama stack build --template ollama --image-type venv
 
       - name: Start Llama Stack server in background
@@ -57,7 +47,6 @@ jobs:
         env:
           INFERENCE_MODEL: "meta-llama/Llama-3.2-3B-Instruct"
         run: |
-          source .venv/bin/activate
           LLAMA_STACK_LOG_FILE=server.log nohup uv run llama stack run ./llama_stack/templates/ollama/run.yaml --image-type venv &
 
       - name: Wait for Llama Stack server to be ready
@@ -85,6 +74,7 @@ jobs:
             echo "Ollama health check failed"
             exit 1
           fi
+
       - name: Check Storage and Memory Available Before Tests
         if: ${{ always() }}
         run: |