CI: add a workflow in .github/ directory for Docker container packaging

I already tested the workflow: https://github.com/AmnaSnene/dhtnet/pkgs/container/dhtnet%2Fdhtnet

Change-Id: I4c21c19d710058e80f17dd6f39080a5d35e174d9

Author: AmnaSnene

.github/workflows/release-package.yml

@@ -0,0 +1,43 @@
+name: Release Package
+
+on:
+  push:
+    branches:
+      - master
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME_DEPS: ${{ github.repository }}/dhtnet
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    name: DHTNet Docker image
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME_DEPS }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}