Add CI job to build and push docker images on GHCR for new versions (#423)

Introduces a new GitHub Actions job to build and publish Docker images for tagged releases. 

The workflow logs in to the GitHub Container Registry, generates metadata, sets up Buildx, and pushes the images with appropriate tags and caching. This change streamlines Docker image distribution for the repository.

Refers to #290

Pipeline have been tested in fork and a test image have been built. Can be tested with the following command : 
```bash
docker run ghcr.io/alphayax/squawk:1.6.1-alpha
```

Test artifact is available in fork here : https://github.com/alphayax/squawk/pkgs/container/squawk/403247135?tag=1.6.1-alpha

Author: alphayax

.github/workflows/rust.yml

@@ -205,6 +205,55 @@ jobs:
         env:
           NODE_AUTH_TOKEN: ${{secrets.npm_token}}
 
+  publish-docker:
+    if: startsWith(github.ref, 'refs/tags/')
+    needs: [build-linux-x64, build-mac, build-windows]
+    runs-on: ubuntu-22.04
+    permissions:
+      contents: read
+      packages: write
+      attestations: write
+      id-token: write
+    env:
+      REGISTRY: ghcr.io
+      IMAGE_NAME: ${{ github.repository }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=raw,value=latest
+            type=ref,event=branch
+            type=sha
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
   lint:
     needs: pre_job
     if: needs.pre_job.outputs.should_skip != 'true'