ci: send test statistics to DataDog (#7786)

.github/actions/setup-go/action.yaml

@@ -8,3 +8,8 @@ runs:
       with:
         cache: true
         go-version: "~1.20"
+    - name: Install gotestsum
+      uses: jaxxstorm/action-install-gh-release@v1.10.0
+      with:
+        repo: gotestyourself/gotestsum
+        tag: v1.9.0

.github/actions/upload-datadog/action.yaml

@@ -0,0 +1,16 @@
+name: Upload tests to datadog
+if: always()
+inputs:
+  api-key:
+    description: "Datadog API key"
+    required: true
+runs:
+  using: "composite"
+  steps:
+    - shell: bash
+      run: |
+        npm install -g @datadog/datadog-ci
+        datadog-ci junit upload --service coder ./gotests.xml \
+          --tags os:${{runner.os}} --tags runner_name:${{runner.name}}
+      env:
+        DATADOG_API_KEY: ${{ inputs.api-key }}