Add GHA for testing and releasing promql-to-dd-go image

.github/workflows/promql-to-dd-go.yaml

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+name: Test, build and publish promql-to-dd-go
+
+on:
+  push:
+    paths:
+      - 'cloud/observability/promql-to-dd-go/**'
+      - '!cloud/observability/promql-to-dd-go/examples/**'
+      - '!cloud/observability/promql-to-dd-go/helm-charts/**'
+    branches:
+      - main
+    tags:
+      - v*
+  pull_request:
+    paths:
+      - 'cloud/observability/promql-to-dd-go/**'
+      - '!cloud/observability/promql-to-dd-go/examples/**'
+      - '!cloud/observability/promql-to-dd-go/helm-charts/**'
+
+jobs:
+  test:
+    uses: ./.github/workflows/promql-to-dd-go_test.yaml
+  push:
+    needs: test
+    uses: ./.github/workflows/promql-to-dd-go_build-publish.yaml

.github/workflows/promql-to-dd-go_build-publish.yaml

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+name: Build and push Docker image
+
+on:
+  workflow_call:
+
+env:
+  IMAGE_NAME: promql-to-dd-go
+
+jobs:
+  push:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Log in to registry
+        # This is where you will update the personal access token to GITHUB_TOKEN
+        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u $ --password-stdin
+
+      - name: Setup Docker metadata
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: |
+            ghcr.io/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=raw,value={{branch}}
+            type=ref,event=branch
+            type=ref,event=pr
+            type=sha
+
+      - name: Build and Push
+        uses: docker/build-push-action@v3
+        with:
+          context: cloud/observability/promql-to-dd-go
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          platforms: linux/amd64,linux/arm64
+          push: true

.github/workflows/promql-to-dd-go_test.yaml

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+name: Test
+
+on:
+  workflow_call:
+
+jobs:
+  test:
+    strategy:
+      fail-fast: true
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Print build information
+        run: 'echo head_ref: ${{ github.head_ref }}, ref: ${{ github.ref }}, os: ${{ matrix.os }}'
+      - uses: actions/checkout@v2
+      - name: Set up Go
+        uses: actions/[email protected]
+        with:
+          go-version: '1.20'
+      - name: build
+        working-directory: cloud/observability/promql-to-dd-go
+        run: make build
+      - name: test
+        working-directory: cloud/observability/promql-to-dd-go
+        run: make test

cloud/observability/promql-to-dd-go/cmd/promqltodd/main.go

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+package main
+
+import (
+	"flag"
+	"log"
+	"os"
+	"time"
+
+	"github.com/temporalio/promql-to-dd-go/datadog"
+	"github.com/temporalio/promql-to-dd-go/prometheus"
+	"github.com/temporalio/promql-to-dd-go/worker"
+)
+
+func main() {
+	set := flag.NewFlagSet("app", flag.ExitOnError)
+	promURL := set.String("prom-endpoint", "", "Prometheus API endpoint for the server")
+	serverRootCACert := set.String("server-root-ca-cert", "", "Optional path to root server CA cert")
+	clientCert := set.String("client-cert", "", "Required path to client cert")
+	clientKey := set.String("client-key", "", "Required path to client key")
+	serverName := set.String("server-name", "", "Server name to use for verifying the server's certificate")
+	insecureSkipVerify := set.Bool("insecure-skip-verify", false, "Skip verification of the server's certificate and host name")
+	matrixPrefix := set.String("matrix-prefix", "temporal_cloud_", "Prefix of the metrics to be queried and send to Datadog")
+	stepDuration := set.Int("step-duration-seconds", 60, "The step between metrics")
+	queryInterval := set.Int("query-interval-seconds", 600, "Interval between each Prometheus query")
+
+	if err := set.Parse(os.Args[1:]); err != nil {
+		log.Fatalf("failed parsing args: %s", err)
+	} else if *clientCert == "" || *clientKey == "" {
+		log.Fatalf("-client-cert and -client-key are required")
+	}
+
+	datadogClient := datadog.NewAPIClient()
+
+	prometheusClient, err := prometheus.NewAPIClient(
+		prometheus.Config{
+			TargetHost:         *promURL,
+			ServerRootCACert:   *serverRootCACert,
+			ClientCert:         *clientCert,
+			ClientKey:          *clientKey,
+			ServerName:         *serverName,
+			InsecureSkipVerify: *insecureSkipVerify,
+		},
+	)
+	if err != nil {
+		log.Fatalf("Failed to create Prometheus client: %s", err)
+	}
+
+	worker := worker.Worker{
+		Querier:       prometheusClient,
+		Submitter:     datadogClient,
+		MetricPrefix:  *matrixPrefix,
+		StepDuration:  time.Duration(*stepDuration) * time.Second,
+		QueryInterval: time.Duration(*queryInterval) * time.Second,
+		Quantiles:     []float64{0.5, 0.9, 0.95, 0.99},
+	}
+
+	worker.Run()
+}