CI: add Docker build workflow

.github/workflows/docker.yml

@@ -0,0 +1,31 @@
+name: Docker Build
+
+on:
+  push:
+    paths-ignore:
+      - "**.md"
+    branches:
+      - main
+
+jobs:
+  build-docker-image:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2.3.5
+        with:
+          fetch-depth: 0
+      - name: Login to Github Docker registery
+        uses: docker/login-action@v1.10.0
+        with:
+          registry: ghcr.io
+          username: jae1911
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v2.7.0
+        with:
+          context: .
+          file: ./Dockerfile
+          platforms: linux/amd64
+          push: true
+          tags: ghcr.io/jae1911/uwu-proxified:latest