ci: limit PR testing based on modified files (#1644)

# What does this PR do?
rather than have unit and functional tests run on all PRs, we should
only have them run on PRs changing relevant files

Signed-off-by: Nathan Weinberg <nweinber@redhat.com>

.github/workflows/integration-tests.yml

@@ -1,9 +1,18 @@
 name: Integration tests
 
 on:
-  pull_request:
   push:
     branches: [ main ]
+  pull_request:
+    branches: [ main ]
+    paths:
+      - 'distributions/**'
+      - 'llama_stack/**'
+      - 'tests/integration/**'
+      - 'uv.lock'
+      - 'pyproject.toml'
+      - 'requirements.txt'
+      - '.github/workflows/integration-tests.yml' # This workflow
 
 jobs:
   ollama:

.github/workflows/unit-tests.yml

@@ -5,6 +5,14 @@ on:
     branches: [ main ]
   pull_request:
     branches: [ main ]
+    paths:
+      - 'distributions/**'
+      - 'llama_stack/**'
+      - 'tests/unit/**'
+      - 'uv.lock'
+      - 'pyproject.toml'
+      - 'requirements.txt'
+      - '.github/workflows/unit-tests.yml' # This workflow
   workflow_dispatch:
 
 jobs: