fix: add DockerHub publishing workflow (#12)

Author: Pradumnasaraf

.github/workflows/docker.yml

@@ -0,0 +1,43 @@
+name: Publish Image to DockerHub
+
+on:
+  workflow_dispatch:
+  release:
+    types: [published]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: get-npm-version
+        id: package-version
+        uses: martinbeentjes/npm-get-version-action@v1.3.1
+
+      - name: DockerHub Login
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Read YAML file for version
+        uses: pietrobolcato/action-read-yaml@1.0.0
+        id: read_yaml
+        with:
+          config: ${{ github.workspace }}/version.yaml
+        
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          tags: |
+            ${{ secrets.DOCKERHUB_USERNAME }}/contributor:latest
+            ${{ secrets.DOCKERHUB_USERNAME }}/contributor:${{ steps.read_yaml.outputs['version'] }}
+          platforms: linux/amd64,linux/arm64,linux/arm/v7