Setup Buildkite (JuliaPerf#23)

* Setup Buildkite

Co-authored-by: Valentin Churavy <[email protected]>

Author: tkf

.buildkite/pipeline.yml

@@ -0,0 +1,11 @@
+steps:
+  - label: "Julia v1.6"
+    plugins:
+      - JuliaCI/julia#v1:
+          version: "1.6"
+      - JuliaCI/julia-test#v1:
+    agents:
+      queue: "juliaecosystem"
+      sandbox.jl: "true"
+      os: "linux"
+    timeout_in_minutes: 60