update clang-tidy to only enable most important checks

Author: atsju

.clang-tidy

@@ -0,0 +1,6 @@
+Checks: >
+  clang-analyzer-*
+  bugprone-*
+  performance-unnecessary-*
+  modernize-use-nullptr
+  modernize-use-nodiscard

.github/workflows/build-linux.yml

@@ -46,6 +46,7 @@ jobs:
           style: '' # we don't want check from clang-format
           lines-changed-only: 'true' # Only lines in the diff that contain additions are analyzed. Avoid noise from existing code.
           thread-comments: 'update'
+          tidy-checks: '' # rely solely on .clang-tidy file
           tidy-review: true
           passive-reviews: true
           ignore: 'bezier|boost|SingleApplication|spdlog|zernike|moc_*|ui_*|qwt*'