Add test to check prometheus remote write output

Author: DefCon-007

.github/workflows/test.yaml

@@ -7,48 +7,60 @@ jobs:
     runs-on: ubuntu-latest
     env:
       K6_CLOUD_TOKEN: ${{ secrets.K6_CLOUD_TOKEN }}
-      K6_CLOUD_PROJECT_ID:  ${{ secrets.K6_CLOUD_PROJECT_ID }}
+      K6_CLOUD_PROJECT_ID: ${{ secrets.K6_CLOUD_PROJECT_ID }}
     steps:
-    - uses: actions/checkout@v4
-    - name: Setup Grafana k6
-      uses: grafana/setup-k6-action@main
-      with:
-        k6-version: '0.49.0'
-    - uses: ./
-      continue-on-error: true
-      with:
-        path: |
-          ./dev/protocol*.js
-        flags: --vus 10 --duration 30s
-        parallel: true
-        cloud-run-locally: false
+      - uses: actions/checkout@v4
+      - name: Setup Grafana k6
+        uses: grafana/setup-k6-action@main
+        with:
+          k6-version: "0.49.0"
+      - uses: ./
+        continue-on-error: true
+        with:
+          path: |
+            ./dev/protocol*.js
+          flags: --vus 10 --duration 30s
+          parallel: true
+          cloud-run-locally: false
   protocol-without-flags:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
-    - name: Setup Grafana k6
-      uses: grafana/setup-k6-action@main
-      with:
-        k6-version: '0.49.0'
-    - uses: ./
-      continue-on-error: true
-      with:
-        path: |
-          ./dev/protocol*.js
+      - uses: actions/checkout@v4
+      - name: Setup Grafana k6
+        uses: grafana/setup-k6-action@main
+        with:
+          k6-version: "0.49.0"
+      - uses: ./
+        continue-on-error: true
+        with:
+          path: |
+            ./dev/protocol*.js
   verify-scripts:
     runs-on: ubuntu-latest
     env:
       K6_CLOUD_TOKEN: ${{ secrets.K6_CLOUD_TOKEN }}
-      K6_CLOUD_PROJECT_ID:  ${{ secrets.K6_CLOUD_PROJECT_ID }}
+      K6_CLOUD_PROJECT_ID: ${{ secrets.K6_CLOUD_PROJECT_ID }}
     steps:
-    - uses: actions/checkout@v4
-    - name: Setup Grafana k6
-      uses: grafana/setup-k6-action@main
-      with:
-        k6-version: '0.49.0'
-    - uses: ./
-      continue-on-error: true
-      with:
-        path: |
-          ./dev/verify-script-tests/**.js
-        only-verify-scripts: true
+      - uses: actions/checkout@v4
+      - name: Setup Grafana k6
+        uses: grafana/setup-k6-action@main
+        with:
+          k6-version: "0.49.0"
+      - uses: ./
+        continue-on-error: true
+        with:
+          path: |
+            ./dev/verify-script-tests/**.js
+          only-verify-scripts: true
+  test-prometheus-remote-write-flag:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Grafana k6
+        uses: grafana/setup-k6-action@main
+      - uses: ./
+        continue-on-error: true
+        with:
+          path: |
+            ./dev/verify-script-tests/**.js
+          flags: --out experimental-prometheus-rw