add image job

.github/workflows/docker-build-push.yaml

@@ -0,0 +1,60 @@
+name: Build and Push mqtt-simulator image to ghcr.io
+
+on:
+  push:
+    branches:
+      - "master"
+  pull_request:
+    branches:
+      - "master"
+
+env:
+  IMAGE_NAME: mqtt-simulator
+
+jobs:
+  buildx-push:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Login to GHCR
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            ${{ github.repository_owner }}/${{ env.IMAGE_NAME }}
+            ghcr.io/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=schedule
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=sha
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+        with:
+          driver-opts: network=host
+          platforms: linux/amd64,linux/arm64
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}