ci: Only run tests when relevant code changes (#245)

.github/workflows/test.yml

@@ -1,6 +1,24 @@
 name: Test target-snowflake
 
-on: [push]
+on:
+  push:
+    branches: [main]
+    paths:
+    - .github/workflows/test.yml
+    - target_snowflake/**
+    - tests/**
+    - poetry.lock
+    - pyproject.toml
+    - tox.ini
+  pull_request:
+    branches: [main]
+    paths:
+    - .github/workflows/test.yml
+    - target_snowflake/**
+    - tests/**
+    - poetry.lock
+    - pyproject.toml
+    - tox.ini
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}