Auto merge of #12200 - aneeshusa:add-linux-dev-yaml, r=larsbergstrom

Add linux dev yaml

<!-- Please describe your changes on the following line: -->

Sync `steps.yml` from saltfs and add `linux-dev-yaml` builder for testing steps.yml switchover. Helps with servo/saltfs#316.

---
<!-- 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 linux-dev-yaml is non-gated and other changes are running in production

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

<!-- Reviewable:start -->
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This change is [<img src="https://reviewable.io/review_button.svg" height="35" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/12200)
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etc/ci/buildbot_steps.yml

@@ -1,8 +1,8 @@
 mac-rel-wpt:
   - ./mach build --release
   - ./mach test-wpt-failure
-  - ./mach test-wpt --release --processes 4 --log-raw test-wpt.log --log-errorsummary wpt-errorsummary.log
-  - ./mach test-wpt --release --binary-arg=--multiprocess --processes 4 --log-raw test-wpt-mp.log --log-errorsummary wpt-mp-errorsummary.log eventsource
+  - ./mach test-wpt --release --processes 8 --log-raw test-wpt.log --log-errorsummary wpt-errorsummary.log
+  - ./mach test-wpt --release --binary-arg=--multiprocess --processes 8 --log-raw test-wpt-mp.log --log-errorsummary wpt-mp-errorsummary.log eventsource
   - ./mach build-cef --release
   - bash ./etc/ci/lockfile_changed.sh
   - bash ./etc/ci/manifest_changed.sh
@@ -22,6 +22,11 @@ mac-rel-css:
   - bash ./etc/ci/lockfile_changed.sh
   - bash ./etc/ci/manifest_changed.sh
 
+mac-nightly:
+  - ./mach build --release
+  - ./mach package --release
+  - ./etc/ci/upload_nightly.sh mac
+
 linux-dev:
   - ./mach test-tidy --no-progress --all
   - ./mach test-tidy --no-progress --self-test
@@ -34,6 +39,18 @@ linux-dev:
   - bash ./etc/ci/manifest_changed.sh
   - bash ./etc/ci/check_no_unwrap.sh
 
+linux-dev-yaml:
+  - ./mach test-tidy --no-progress --all
+  - ./mach test-tidy --no-progress --self-test
+  - ./mach build --dev
+  - ./mach test-compiletest
+  - ./mach test-unit
+  - ./mach build-cef
+  - ./mach build-geckolib
+  - bash ./etc/ci/lockfile_changed.sh
+  - bash ./etc/ci/manifest_changed.sh
+  - bash ./etc/ci/check_no_unwrap.sh
+
 linux-rel:
   - ./mach build --release
   - ./mach test-wpt-failure
@@ -45,16 +62,22 @@ linux-rel:
   - bash ./etc/ci/lockfile_changed.sh
   - bash ./etc/ci/manifest_changed.sh
 
+linux-nightly:
+  - ./mach build --release
+  - ./mach package --release
+  - ./etc/ci/upload_nightly.sh linux
+
 android:
   - ./mach build --android --dev
+  - ./mach package --android --dev
   - bash ./etc/ci/lockfile_changed.sh
   - bash ./etc/ci/manifest_changed.sh
   - python ./etc/ci/check_dynamic_symbols.py
 
 android-nightly:
   - ./mach build --android --release
-  - ./mach package -r
-  - s3cmd put target/arm-linux-androideabi/release/servo.apk s3://servo-rust/nightly/servo.apk
+  - ./mach package --android --release
+  - ./etc/ci/upload_nightly.sh android
 
 arm32:
   - ./mach build --rel --target=arm-unknown-linux-gnueabihf