Automate build to ghcr

.github/workflows/dockerimage.yml

@@ -0,0 +1,30 @@
+---
+name: Build and push docker image
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - '*'
+jobs:
+  build:
+    name: Create docker image
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Login to registries
+        shell: bash
+        run: |
+          echo "${{ secrets.GHCR_PAT }}" | docker login -u nadyita --password-stdin ghcr.io
+      - name: Build and push the Docker image
+        shell: bash
+        run: |
+          docker buildx build \
+            --push \
+            --file Dockerfile \
+            --tag "ghcr.io/nadybot/pork-history-syncer:latest" \
+            --tag "ghcr.io/nadybot/pork-history-syncer:latest-$(date +'%Y%m%d-%H%M%S')" \
+            .