e2e: only run PR job if certain files are changed

currently the E2E PR job runs on every single PR
this commit aligns the triggering criteria for
the job with the mergify automerge criteria

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

Author: nathan-weinberg

.github/mergify.yml

@@ -28,6 +28,7 @@ pull_request_rules:
     # e2e workflow
     - or:
       - and:
+        # note this should match the triggering criteria in 'e2e-nvidia-t4-x1.yml'
         - check-success=e2e-workflow-complete
         - or:
           - files~=\.py$

.github/workflows/e2e-nvidia-t4-x1.yml

@@ -3,10 +3,12 @@
 name: E2E (NVIDIA Tesla T4 x1)
 
 on:
+  # run against every merge commit to 'main' and release branches
   push:
     branches:
       - main
       - release-*
+  # only run on PRs that touch certain regex paths
   pull_request_target:
     types:
       - opened
@@ -15,6 +17,12 @@ on:
     branches:
       - main
       - release-*
+    paths:
+      # note this should match the merging criteria in 'mergify.yml'
+      - '**.py'
+      - 'pyproject.toml'
+      - 'requirements**.txt'
+      - '.github/workflows/e2e-nvidia-t4-x1.yml' # This workflow
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}