Enable perf try builder

This adds a dedicated branch for perf to use for CI, intended to allow perf to
enqueue builds without needing to use bors. bors is great, but bors requires an
open PR to work, and we want to invoke perf on closed PRs sometimes (in
particular, rollups).

.github/workflows/ci.yml

@@ -20,6 +20,7 @@ name: CI
     branches:
       - auto
       - try
+      - try-perf
       - master
   pull_request:
     branches:
@@ -146,7 +147,7 @@ jobs:
       CACHES_AWS_ACCESS_KEY_ID: AKIA46X5W6CZI5DHEBFL
       ARTIFACTS_AWS_ACCESS_KEY_ID: AKIA46X5W6CZN24CBO55
       CACHE_DOMAIN: ci-caches.rust-lang.org
-    if: "github.event_name == 'push' && github.ref == 'refs/heads/try' && github.repository == 'rust-lang-ci/rust'"
+    if: "github.event_name == 'push' && (github.ref == 'refs/heads/try' || github.ref == 'refs/heads/try-perf') && github.repository == 'rust-lang-ci/rust'"
     strategy:
       matrix:
         include:
@@ -717,7 +718,7 @@ jobs:
   try-success:
     needs:
       - try
-    if: "success() && github.event_name == 'push' && github.ref == 'refs/heads/try' && github.repository == 'rust-lang-ci/rust'"
+    if: "success() && github.event_name == 'push' && (github.ref == 'refs/heads/try' || github.ref == 'refs/heads/try-perf') && github.repository == 'rust-lang-ci/rust'"
     steps:
       - name: mark the job as a success
         run: exit 0
@@ -727,7 +728,7 @@ jobs:
   try-failure:
     needs:
       - try
-    if: "!success() && github.event_name == 'push' && github.ref == 'refs/heads/try' && github.repository == 'rust-lang-ci/rust'"
+    if: "!success() && github.event_name == 'push' && (github.ref == 'refs/heads/try' || github.ref == 'refs/heads/try-perf') && github.repository == 'rust-lang-ci/rust'"
     steps:
       - name: mark the job as a failure
         run: exit 1

src/ci/github-actions/ci.yml

@@ -247,6 +247,7 @@ on:
     branches:
       - auto
       - try
+      - try-perf
       - master
   pull_request:
     branches:
@@ -285,7 +286,7 @@ jobs:
     name: try
     env:
       <<: [*shared-ci-variables, *prod-variables]
-    if: github.event_name == 'push' && github.ref == 'refs/heads/try' && github.repository == 'rust-lang-ci/rust'
+    if: github.event_name == 'push' && (github.ref == 'refs/heads/try' || github.ref == 'refs/heads/try-perf') && github.repository == 'rust-lang-ci/rust'
     strategy:
       matrix:
         include:
@@ -645,11 +646,11 @@ jobs:
   # successful listening to webhooks only.
   try-success:
     needs: [try]
-    if: "success() && github.event_name == 'push' && github.ref == 'refs/heads/try' && github.repository == 'rust-lang-ci/rust'"
+    if: "success() && github.event_name == 'push' && (github.ref == 'refs/heads/try' || github.ref == 'refs/heads/try-perf') && github.repository == 'rust-lang-ci/rust'"
     <<: *base-success-job
   try-failure:
     needs: [try]
-    if: "!success() && github.event_name == 'push' && github.ref == 'refs/heads/try' && github.repository == 'rust-lang-ci/rust'"
+    if: "!success() && github.event_name == 'push' && (github.ref == 'refs/heads/try' || github.ref == 'refs/heads/try-perf') && github.repository == 'rust-lang-ci/rust'"
     <<: *base-failure-job
   auto-success:
     needs: [auto]