Merge pull request #17 from jemand771/dev

* add github actions build for docker images
* publish to ghcr and docker hub

.github/workflows/docker-build.yml

@@ -0,0 +1,74 @@
+name: docker-build
+
+on:
+  push:
+    branches:
+      - "main"
+      - "dev"
+    tags:
+      - "v*.*.*"
+  workflow_dispatch:
+
+
+jobs:
+  buildx:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v3
+        with:
+          images: |
+            jemand771/latex-build
+            ghcr.io/jemand771/latex-build
+          flavor: |
+            latest=false
+          tags: |
+            type=semver,pattern=v{{version}}
+            type=raw,enable=${{ github.ref == 'refs/heads/main' }},value=latest
+            type=raw,enable=${{ github.ref == 'refs/heads/dev' }},value=experimental
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+        with:
+          install: true
+      - name: Login to Docker Hub
+        uses: docker/login-action@v1 
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1 
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Set up docker cache
+        uses: actions/cache@v2
+        with:
+          path: /tmp/.buildx-cache
+          key: buildx-${{ runner.os }}-${{ github.sha }}
+          restore-keys: |
+            buildx-${{ runner.os }}-
+            buildx-
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max
+        # TODO remove me. prevent the cache from growing infinitely
+        # https://github.com/docker/build-push-action/issues/252
+        # https://github.com/moby/buildkit/issues/1896
+      - name: Move cache
+        run: |
+          rm -rf /tmp/.buildx-cache
+          mv /tmp/.buildx-cache-new /tmp/.buildx-cache