ci: cleanup github actions (#803)

.github/workflows/main-docker.yml

@@ -0,0 +1,58 @@
+name: Docker Build
+
+on:
+  push:
+    paths-ignore:
+      - "**.md"
+    branches:
+      - 'main'
+      - 'master'
+
+jobs:
+  build-docker:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        config:
+          - { platform: 'linux/amd64', tag: 'latest', dockerfile: 'Dockerfile' }
+          - { platform: 'linux/arm64', tag: 'latest-arm', dockerfile: 'Dockerfile.arm' }
+          - { platform: 'linux/arm/v7', tag: 'latest-armv7', dockerfile: 'Dockerfile.armv7' }
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+        with:
+          platforms: all
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v2
+        with:
+          version: latest
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Docker Hub Description
+        uses: peter-evans/dockerhub-description@v3
+        if: matrix.config.platform == 'linux/amd64'
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+          repository: libreddit/libreddit
+
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          file: ./${{ matrix.config.dockerfile }}
+          platforms: ${{ matrix.config.platform }}
+          push: true
+          tags: libreddit/libreddit:${{ matrix.config.tag }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max