Skip build if only docs/icons changed (#908)

Signed-off-by: Teresa Chen <[email protected]>

Author: Teresa Chen

.buildkite/main.yml

@@ -1,6 +1,9 @@
+x-run-condition: &run-on-nightly-or-tag
+  if: build.env("NIGHTLY") == "1" || build.tag =~ /^v?[0-9]+(\.[a-zA-Z0-9]+)*([a-zA-Z]+[0-9]*)?$/
+
 steps:
    - label: "Upload Tests for Models & Features"
-     if: build.env("NIGHTLY") == "1" || build.tag =~ /^v?[0-9]+(\.[a-zA-Z0-9]+)*([a-zA-Z]+[0-9]*)?$/
+     <<: *run-on-nightly-or-tag
      agents:
        # TODO : can be done on non-TPU queues once they're set up b/449203039
        queue: tpu_v6e_queue
@@ -11,7 +14,7 @@ steps:
      continue_on_failure: true  # ensure we still generate support matrices even if some tests fail
 
    - label: "Generate support matrices"
-     if: build.env("NIGHTLY") == "1" || build.tag =~ /^v?[0-9]+(\.[a-zA-Z0-9]+)*([a-zA-Z]+[0-9]*)?$/
+     <<: *run-on-nightly-or-tag
      key: generate_support_matrices
      agents:
        queue: tpu_v6e_queue
@@ -39,7 +42,7 @@ steps:
 #       - echo "committing verified commit hashes"
 #
    - label: "Commit support matrices if is nightly build"
-     if: build.env("NIGHTLY") == "1" || build.tag =~ /^v?[0-9]+(\.[a-zA-Z0-9]+)*([a-zA-Z]+[0-9]*)?$/
+     <<: *run-on-nightly-or-tag
      key: commit_nightly_support_matrices
      depends_on: generate_support_matrices
      agents:

.buildkite/scripts/bootstrap.sh

@@ -1,5 +1,25 @@
 #!/bin/bash
 
+# --- Skip build if only docs/icons changed ---
+echo "--- :git: Checking changed files"
+
+# Get a list of all files changed in this commit
+FILES_CHANGED=$(git diff-tree --no-commit-id --name-only -r "$BUILDKITE_COMMIT")
+
+echo "Files changed:"
+echo "$FILES_CHANGED"
+
+# Filter out files we want to skip builds for.
+NON_SKIPPABLE_FILES=$(echo "$FILES_CHANGED" | grep -vE "(\.md$|\.ico$|\.png$|^README$|^docs\/)")
+
+if [ -z "$NON_SKIPPABLE_FILES" ]; then
+  echo "Only documentation or icon files changed. Skipping build."
+  # No pipeline will be uploaded, and the build will complete.
+  exit 0
+else
+  echo "Code files changed. Proceeding with pipeline upload."
+fi
+
 upload_pipeline() {
     buildkite-agent pipeline upload .buildkite/pipeline_jax.yml
     # buildkite-agent pipeline upload .buildkite/pipeline_torch.yml