Update pr-tools.yml trigger to skip irrelevant changes (#4888)

The tools workflow was triggering on every PR event, including changes
to markdown, CI YAML, and Docker files that can't affect tool
compilation or behavior.

Author: SeanTAllen

.github/workflows/pr-tools.yml

@@ -1,6 +1,15 @@
 name: Tools
 
-on: pull_request
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
+    paths:
+      - '**'
+      - '!**/*.md'
+      - '!**/*.yml'
+      - '!.dockerfiles/**'
+      - '!.ci-dockerfiles/**'
+      - '.github/workflows/pr-tools.yml'
 
 concurrency:
   group: pr-tools-${{ github.ref }}