Add buildkite config

We're going to test on buildkite, since there's something wrong with the
GHA environment and I don't control that as tightly as I control
buildkite.

Author: staticfloat

.buildkite/pipeline.yml

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+steps:
+  - label: ":rocket: Launch matrix of options"
+    commands: |
+      # These variables are available for templating in our child pipelines
+      export JULIA_VERSION OS ARCH AGENT_ARCH ROOTFS_URL ROOTFS_HASH DOCKER_IMAGE
+
+      function upload_pipeline() {
+        buildkite-agent pipeline upload .buildkite/test_$${OS}.yml
+      }
+
+      # We'll test on the following julia versions
+      for JULIA_VERSION in 1.8 nightly; do
+        # First, linux
+        OS="linux"
+        
+        ARCH="x86_64"
+        AGENT_ARCH="x86_64"
+        ROOTFS_URL="https://github.com/JuliaCI/rootfs-images/releases/download/v5.26/package_linux.x86_64.tar.gz"
+        ROOTFS_HASH="5b0b851aca3c941b900a1301c13922c6cfc7f211"
+        upload_pipeline
+
+        # We still schedule this one on an x86_64 machine, but use an i686 rootfs
+        ARCH="i686"
+        AGENT_ARCH="x86_64"
+        ROOTFS_URL="https://github.com/JuliaCI/rootfs-images/releases/download/v5.26/package_linux.i686.tar.gz"
+        ROOTFS_HASH="abe9ca251b93980e444738b3996779d60ea7045d"
+        upload_pipeline
+
+        ARCH="aarch64"
+        AGENT_ARCH="aarch64"
+        ROOTFS_URL="https://github.com/JuliaCI/rootfs-images/releases/download/v5.26/package_linux.aarch64.tar.gz"
+        ROOTFS_HASH="dcf39d10ba43bf13c75d5031c3a88f125780033b"
+        upload_pipeline
+
+
+        # Next, windows
+        OS="windows"
+        ARCH="x86_64"
+        AGENT_ARCH="x86_64"
+        DOCKER_IMAGE="juliapackaging/package-windows-x86_64:v5.44"
+        upload_pipeline
+
+        # same as for Linux, we schedule on an x86_64 machine, but use an i686 docker image
+        OS="windows"
+        ARCH="i686"
+        AGENT_ARCH="x86_64"
+        DOCKER_IMAGE="juliapackaging/package-windows-i686:v5.44"
+        upload_pipeline
+        
+
+
+        # Finally, macOS
+        OS="macos"
+        for ARCH in x86_64 aarch64; do
+          AGENT_ARCH="$${ARCH}"
+          upload_pipeline
+        done
+      done
+    agents:
+      queue: "juliaecosystem"
+
+  - label: "func_list idempotency"
+    commands: |
+      cd ext/gensymbol
+      ./generate_func_list.sh
+      git diff --exit-code
+    agents:
+      queue: "juliaecosystem"
+      os: "linux"
+      arch: "x86_64"

.buildkite/test_linux.yml

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+steps:
+  - label: ":julia: :linux: ${ARCH?} Julia ${JULIA_VERSION?}"
+    plugins:
+      - JuliaCI/julia#v1:
+          version: "${JULIA_VERSION?}"
+      - staticfloat/sandbox#v1:
+          rootfs_url: "${ROOTFS_URL?}"
+          rootfs_treehash: "${ROOTFS_HASH?}"
+          uid: 0
+          gid: 0
+          workspaces:
+            - "/cache:/cache"
+      - staticfloat/metahook#sf/windows_backslashes:
+          pre-command: |
+            # Upgrade our debian package to bullseye (wowza)
+            if [[ $$(uname -m) == "x86_64" ]] || [[ $$(uname -m) == "aarch64" ]]; then
+              echo "deb http://deb.debian.org/debian bullseye main" > /etc/apt/sources.list.d/bullseye.list
+              apt update && apt install -y libblas64-dev liblapack64-dev
+            fi
+    commands: |
+      julia --project=test -e 'import Pkg; Pkg.instantiate()'
+      echo "+++ run tests"
+      julia --project=test test/runtests.jl
+    agents:
+      queue: "juliaecosystem"
+      os: "linux"
+      sandbox.jl: "true"
+      arch: "${AGENT_ARCH?}"

.buildkite/test_macos.yml

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+steps:
+  - label: ":julia: :macos: ${ARCH?} Julia ${JULIA_VERSION?}"
+    plugins:
+      - JuliaCI/julia#v1:
+          version: "${JULIA_VERSION?}"
+      - staticfloat/metahook#sf/windows_backslashes:
+          pre-command: |
+            echo "This is a test"
+    commands: |
+      julia --project=test -e 'import Pkg; Pkg.instantiate()'
+      echo "+++ run tests"
+      julia --project=test test/runtests.jl
+    agents:
+      queue: "juliaecosystem"
+      os: "macos"
+      arch: "${AGENT_ARCH?}"

.buildkite/test_windows.yml

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+steps:
+  - label: ":julia: :windows: ${ARCH?} Julia ${JULIA_VERSION?}"
+    plugins:
+      - JuliaCI/julia#v1:
+          version: "${JULIA_VERSION?}"
+      - staticfloat/metahook#sf/windows_backslashes:
+          # Copy our julia installation to a known location that we can mount with docker
+          pre-command: |
+            cp $(dirname $(dirname $(which julia))) /c/buildkite-agent
+      - docker#v3.13.0:
+          image: "${DOCKER_IMAGE?}"
+          always-pull: true
+          volumes:
+            # Abuse the fact that we have a `PATH` mapping for `buildkite-agent`
+            # to mount in our build of Julia for use within the container:
+            - "C:\\buildkite-agent\\bin:C:\\buildkite-agent\\bin"
+    commands: |
+      julia --project=test -e 'import Pkg; Pkg.instantiate()'
+      echo "+++ run tests"
+      julia --project=test test/runtests.jl
+    agents:
+      queue: "juliaecosystem"
+      os: "windows"
+      arch: "${AGENT_ARCH?}"