feat: add workflow for ghrc docker image build

Author: mahiarirani

.github/workflows/publish_ghcr.yaml

@@ -0,0 +1,49 @@
+name: Publish Docker image to GitHub Packages
+
+on:
+  release:
+    types: [published]
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  publish-to-ghcr:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ghcr.io/${{ github.repository_owner }}/etherproxy
+          tags: |
+            type=ref,event=tag
+            type=ref,event=branch
+            type=sha
+      
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}