feat: add docker build & push to ghcr action (#1377)

.github/workflows/docker.yml

@@ -0,0 +1,43 @@
+name: Build & Push docker container
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - '*'
+  pull_request:
+    branches:
+      - main
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Docker meta
+        id: metal
+        uses: docker/metadata-action@v4
+        with:
+          images: |
+            ghcr.io/elk-zone/elk
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      - name: Login to GitHub Container Registry
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and push
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          platforms: linux/amd64
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.metal.outputs.tags }}
+          labels: ${{ steps.metal.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max