Buildkite: add test on macos (#112)

## What does this PR do? Why is it important?
to complete migration to BK (Jenkins job had tests on macos) 

## Checklist

- [x] My code follows the style guidelines of this project
- [x] I have commented my code, particularly in hard-to-understand areas
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] I have added an entry in `CHANGELOG.md`


## Related issues
- Relates [#1711](https://github.com/elastic/ingest-dev/issues/1711)

____
windows and MacOS are failing:
#109

.buildkite/hooks/pre-command

@@ -3,3 +3,10 @@
 set -euo pipefail
 
 export GO_VERSION=$(cat .go-version)
+
+# addtional preparation for macos step
+if [[ "$BUILDKITE_PIPELINE_SLUG" == "elastic-agent-system-metrics" && "$BUILDKITE_STEP_KEY" == "macos-test" ]]; then
+    echo "--- prepare env"
+    source .buildkite/scripts/common.sh
+    with_go ${GO_VERSION} ${SETUP_GVM_VERSION}
+fi

.buildkite/pipeline.yml

@@ -32,6 +32,14 @@ steps:
       image: "${WINDOWS_AGENT_IMAGE}"
     artifact_paths: "*.xml"
 
+  - label: ":linux: Tests on MacOS"
+    key: macos-test
+    command: ".buildkite/scripts/run-linux-tests.sh junit-mac-report.xml"
+    agents:
+      provider: "orka"
+      imagePrefix: generic-13-ventura-arm
+    artifact_paths: "*.xml"
+
   - label: ":junit: Junit annotate"
     plugins:
       - junit-annotate#v2.4.1:
@@ -44,3 +52,5 @@ steps:
         allow_failure: true
       - step: "windows-test"
         allow_failure: true
+      - step: "macos-test"
+        allow_failure: true

.buildkite/scripts/common.sh

@@ -23,6 +23,32 @@ install_go_dependencies() {
     done
 }
 
+with_go() {
+    local go_version=$1
+    local gvm_version=$2
+    url=$(get_gvm_link "${gvm_version}")
+    WORKSPACE=${WORKSPACE:-"$(pwd)"}
+    mkdir -p "${WORKSPACE}/bin"
+    export PATH="${PATH}:${WORKSPACE}/bin"
+    retry 5 curl -L -o "${WORKSPACE}/bin/gvm" "${url}"
+    chmod +x "${WORKSPACE}/bin/gvm"
+    ls ${WORKSPACE}/bin/
+    eval "$(gvm $go_version)"
+    go_path="$(go env GOPATH):$(go env GOPATH)/bin"
+    export PATH="${PATH}:${go_path}"
+    go version
+}
+
+# for gvm link
+get_gvm_link() {
+    local gvm_version=$1
+    platform_type="$(uname)"
+    arch_type="$(uname -m)"
+    [[ ${arch_type} == "aarch64" ]] && arch_type="arm64" # gvm do not have 'aarch64' name for archetecture type
+    [[ ${arch_type} == "x86_64" ]] && arch_type="amd64"
+    echo "https://github.com/andrewkroh/gvm/releases/download/${gvm_version}/gvm-${platform_type}-${arch_type}"
+}
+
 retry() {
     local retries=$1
     shift

.buildkite/scripts/run-linux-tests.sh

@@ -1,9 +1,10 @@
 #!/bin/bash
+junitfile=$1 # filename for jnit annotation plugin
 
 set -euo pipefail
 
 source .buildkite/scripts/common.sh
 
 install_go_dependencies
 
-gotestsum --format testname --junitfile junit-report.xml -- -v ./...
+gotestsum --format testname --junitfile "${junitfile:-junit-lin-report.xml}" -- -v ./...

catalog-info.yaml

@@ -37,6 +37,7 @@ spec:
       branch_configuration: "main v0.*"
       repository: elastic/elastic-agent-system-metrics
       pipeline_file: ".buildkite/pipeline.yml"
+      maximum_timeout_in_minutes: 60
       provider_settings:
         build_pull_request_forks: false
         build_pull_requests: true # requires filter_enabled and filter_condition settings as below when used with buildkite-pr-bot