Add GHA workflow to push to ghcr.io

.github/workflows/push-to-ghcr.yml

@@ -0,0 +1,25 @@
+name: Build and Publish Docker Image
+
+on: push
+
+jobs:
+  docker_build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          push: true
+          tags: ghcr.io/wistia/udp-replicator:${{ github.sha }}