Merge pull request #8325 from jepler/ci-matrix-docs-conf

ci_set_matrix: changing conf.py should not rebuild all boards

Author: jepler

tools/ci_set_matrix.py

@@ -45,6 +45,7 @@
 # Files that never influence board builds
 IGNORE_BOARD = {
     ".devcontainer",
+    "conf.py",
     "docs",
     "tests",
     "tools/ci_changes_per_commit.py",