sitespeed.io action example (#3586)

.github/budget.json

@@ -0,0 +1,13 @@
+{
+    "budget": {
+      "thirdParty": {
+          "requests": 0
+      },
+      "score": {
+        "bestpractice": 100,
+        "privacy": 100,
+        "performance": 98
+      }
+    }
+  }
+  

.github/workflows/sitespeed-io-action-example.yml

@@ -0,0 +1,21 @@
+name: sitespeed.io action example
+on:
+  push:
+    branches:
+    - main
+jobs:
+  run-sitespeed:
+    runs-on: ubuntu-latest
+    name: running sitespeed.io
+    steps:
+      - name: code checkout
+        uses: actions/checkout@v2
+      # Here we build our own container to make sure we test against our latest code
+      # but YOU can just used the latest version by specifying 
+      # sitespeedio/sitespeed.io:VERSION
+      - name: Build Docker containers
+        run: |
+          docker buildx install
+          docker buildx build --load --platform linux/amd64 -t sitespeedio/sitespeed.io .
+      - name: running sitespeed.io container with arguments and optional Docker options
+        run: docker run -v "$(pwd):/sitespeed.io" sitespeedio/sitespeed.io https://www.sitespeed.io --budget.configPath .github/budget.json -n 1