[emeryberger]

Summary

• Workflow triggers: CI only ran on `push`, so PRs from forks (e.g. Fix backing-file offset truncation at 4 GiB #129) never got CI, and there was no way to re-run CI on a commit once its last run was older than 30 days. Adds `pull_request` and `workflow_dispatch` triggers.
• CMake test list: `src/CMakeLists.txt` listed the unit test files by hand and was missing `cacheline_padding_test.cc` and `fork_test.cc`, so the CMake job ran 35 tests while Bazel's glob ran 50 on Linux.

Testing

• CI on this branch (run 39331988088): all three jobs pass. Ubuntu_cmake now runs 50 tests, the same as Ubuntu_bazel.
• Local CMake build on macOS (arm64): 53/53 tests pass, the same as Bazel.

Notes

• PRs from branches in this repo will now run CI twice (once for `push`, once for `pull_request`). That's harmless, just extra runner time.
• Not fixed here: the CMake build fails with `make -j`, because the sources don't declare a dependency on the Heap-Layers download. CI builds serially, so it isn't affected.

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