Added Github Workflow to build docker image and publish it

.github/workflows/docker-image.yml

@@ -0,0 +1,42 @@
+name: Docker Image CI
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - '*'
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Extract GitHub tag # strip "v" from release version so this value can be used as tag for docker image
+        id: extract_tag
+        run: |
+          echo "GIT_TAG=${GITHUB_REF#refs/tags/v}" >> $GITHUB_ENV
+        if: startsWith(github.ref, 'refs/tags/v')
+      - name: Print GitHub tag
+        run: |
+          echo "The value of GIT_TAG is: $GIT_TAG"
+        if: startsWith(github.ref, 'refs/tags/v')
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          push: true
+          platforms: linux/amd64,linux/arm64
+          tags: |
+            tess1o/go-tapo-exporter:latest
+            tess1o/go-tapo-exporter:${{ env.GIT_TAG || github.sha }}