Run os-compat workflow on dependabot updates to the workflow

We recently saw CI miss some failures because this workflow was skipped
on a dependabot update that updates the workflow file itself.

This also fixes GitHub actions to skip this build in the merge queue if
it was skipped on CI.

.github/workflows/os-compatibility-test.yaml

@@ -2,22 +2,35 @@ name: OS Compatibility Test
 run-name: OS Compatibility Test
 on:
   pull_request:
-    paths-ignore:
-      - 'docs/**'
-      - 'web/**'
-      - 'rfd/**'
-      - '**/*.md*'
   merge_group:
-    paths-ignore:
-      - 'docs/**'
-      - 'web/**'
-      - 'rfd/**'
-      - '**/*.md*'
 
 jobs:
+  changes:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: read
+    outputs:
+      this-workflow: ${{ steps.changes.outputs.this-workflow }}
+      binary-sources: ${{ steps.changes.outputs.binary-sources }}
+    steps:
+    - uses: dorny/paths-filter@4512585405083f25c027a35db413c2b3b9006d50 # v2.11.1
+      id: changes
+      with:
+        filters: |
+          this-workflow:
+            - '.github/workflows/os-compatibility-test.yaml'
+          binary-sources:
+            - '**/*.c'
+            - '**/*.go'
+            - '**/go.mod'
+            - '**/go.sum'
+            - '**/Makefile'
+            - '**/*.mk'
+
   build:
     name: OS Compatibility Build
-    if: ${{ !startsWith(github.head_ref, 'dependabot/') }}
+    needs: changes
+    if: ${{ needs.changes.outputs.this-workflow == 'true' || (needs.changes.outputs.binary-sources == 'true' && !startsWith(github.head_ref, 'dependabot/'))  }}
     runs-on: ubuntu-22.04-16core
 
     permissions: