Add mono latest and libfreetype6 to java (#18)

Changes codestyle of Java images

.github/workflows/mono.yml

@@ -0,0 +1,38 @@
+name: build mono
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 0 * * 1"
+  push:
+    branches:
+      - master
+    paths:
+      - mono/**
+jobs:
+  push:
+    name: "yolks:mono_${{ matrix.tag }}"
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        tag:
+          - latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: docker/setup-buildx-action@v1
+        with:
+          version: "v0.5.1"
+          buildkitd-flags: --debug
+      - uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.REGISTRY_TOKEN }}
+      - uses: docker/build-push-action@v2
+        with:
+          context: ./mono
+          file: ./mono/${{ matrix.tag }}/Dockerfile
+          platforms: linux/amd64
+          push: true
+          tags: |
+            ghcr.io/parkervcp/yolks:mono_${{ matrix.tag }}