Support memory report logs with interleaved non-report output
<!-- Please describe your changes on the following line: -->
`line 30-31` in `servo/etc/memory_reports_over_time.py` should just ignore any line that doesn't begin with `|`.
The new if statement added such as `if line.startswith('|'):` then continue to append. So, only lines begin with `|` will be appended.
---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [ ] These changes fix #20257(github issue number if applicable).
<!-- Either: -->
- [X] There are tests for these changes OR
- [ ] These changes do not require tests because of __
<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->
<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/20259)
<!-- Reviewable:end -->
Include non-upstream metadata changes in WPT sync.
The original sync work excluded changes to metadata files under tests/wpt/mozilla under the assumption that any change in test results indicated an existing intermittent issue. This is incorrect, because these tests rely on shared infrastructure with upstream, so the results can be influenced by syncing.
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/20112)
<!-- Reviewable:end -->
Supress output from git push in WPT sync.
Pushing to the remote exposes sensitive data in the logs of the job. The old token has been revoked as a consequence.
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/19920)
<!-- Reviewable:end -->
* The commit author is inferred from the hostname
* There's no debug build present, so the update-manifest command exits immediately
* The test run opens too many files and is killed
Move global CI environment variables to servo
Migrate RUST_BACKTRACE out of saltfs.
SCCACHE_IDLE_TIMEOUT has already been migrated.
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [ ] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes help with servo/saltfs#770 (github issue number if applicable).
<!-- Either: -->
- [ ] There are tests for these changes OR
- [x] These changes do not require tests because they change the CI configuration
<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->
<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/19882)
<!-- Reviewable:end -->
Re-enable sccache for Linux builds
As far as I know, sccache is working properly
on the non-cross-compiling Linux builders.
For safety, only enable it for the builders that run on PRs,
to avoid breaking our nightly generation and scheduled test runs.
This will also allow testing new versions of sccache more easily.
This implements my suggestion from https://github.com/servo/servo/pull/19858#issuecomment-360514782, and should also let us
handle testing a new sccache: https://github.com/rust-lang/rust/issues/42867#issuecomment-358692077 (our current version of sccache [seems to be 2018-01-09](f50214b8fa/servo-build-dependencies/ci-map.jinja (L5))).
<!-- Please describe your changes on the following line: -->
---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [ ] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [ ] These changes fix #__ (github issue number if applicable).
<!-- Either: -->
- [ ] There are tests for these changes OR
- [x] These changes do not require tests because they change the CI configuration
<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->
<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/19883)
<!-- Reviewable:end -->
Originally, buildbot would try to directly execute `RUSTFLAGS=` as a binary
since it was the first token in the command string, which won't work.
Fix this by using the `env` command to set the environment variables,
as there is currently no support for setting per-step environment variables
in the `buildbot_steps.yml` file.
As far as I know, sccache is working properly
on the non-cross-compiling Linux builders.
For safety, only enable it for the builders that run on PRs,
to avoid breaking our nightly generation and scheduled test runs.
This will also allow testing new versions of sccache more easily.
Add script to automate pulling changes from upstream WPT.
I want to make automated WPT syncing happen this quarter. This script should allow us to run a nightly job on the builder that grabs the latest changes from upstream runs our testsuite, updates the expected test results, then open a PR with the changes. It still requires saltfs changes to allow it to actually run, but I don't see any harm in getting it reviewed and merged before everything is ready.
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/18726)
<!-- Reviewable:end -->
Added --progress flag to test-perf git commands
<!-- Please describe your changes on the following line: -->
Adding a `--progress` flag to git commands in test-perf to try to avoid the timeouts we're seeing at http://build.servo.org/builders/linux-nightly/builds/581/steps/test/logs/stdio
---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes do not require tests because this is test infrastructure
<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->
<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/19855)
<!-- Reviewable:end -->